Fix valgrind error on I420ToNV12.  Do any conversions first, and work toward fastest, which produces more stable results for the tests that matter.
BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/938005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@445 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=135
TEST=/libyuv_unittest --gtest_filter=*NV*
Review URL: https://webrtc-codereview.appspot.com/939005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@444 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=planar unittests
Review URL: https://webrtc-codereview.appspot.com/935006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@443 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/935004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@442 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/934004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@441 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none

git-svn-id: http://libyuv.googlecode.com/svn/trunk@440 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=convert_test
Review URL: https://webrtc-codereview.appspot.com/932004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@439 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/924005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@438 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/922007

git-svn-id: http://libyuv.googlecode.com/svn/trunk@437 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/918006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@436 16f28f9a-4ce2-e073-06de-1de4eb20be90

Neon version of I420ToNV12 and I420ToNV21.  NV21ToI420 added as function.  CopyRow changed to vld4.8 to allow unaligned copy.
BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/922005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@435 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/920005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@434 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=125
TESTED=local build with gtest errors disabled
Review URL: https://webrtc-codereview.appspot.com/924004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@433 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=126
TEST=NONE
Review URL: https://webrtc-codereview.appspot.com/918005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@432 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=unittests
Review URL: https://webrtc-codereview.appspot.com/917006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@431 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/914005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@430 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/921004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@429 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=114
TEST=libyuvTest.I420ToRGB565_Any
Review URL: https://webrtc-codereview.appspot.com/919004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@428 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/916004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@427 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=126
TEST=convert tests NV12 with alignments
Review URL: https://webrtc-codereview.appspot.com/896007

git-svn-id: http://libyuv.googlecode.com/svn/trunk@426 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/898004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@425 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/887006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@424 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=107
TEST=convert_test
Review URL: https://webrtc-codereview.appspot.com/892004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@423 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/895004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@422 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=build on x86 linux
Review URL: https://webrtc-codereview.appspot.com/889005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@421 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/881004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@420 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=*NV12*
Review URL: https://webrtc-codereview.appspot.com/885004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@419 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=126
TEST=lint passes and rotate_test and cpu_test on try bot pass.
Review URL: https://webrtc-codereview.appspot.com/884004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@418 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=adds new test in rotate_test
Review URL: https://webrtc-codereview.appspot.com/883004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@417 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=126
TEST=rotate_test and cpu_test updated
Review URL: https://webrtc-codereview.appspot.com/879005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@416 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/875004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@415 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=91
TEST=build bot
Review URL: https://webrtc-codereview.appspot.com/860015

git-svn-id: http://libyuv.googlecode.com/svn/trunk@414 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=convert_test *I422ToYUY2*
Review URL: https://webrtc-codereview.appspot.com/869008

git-svn-id: http://libyuv.googlecode.com/svn/trunk@413 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=91
TEST=I420ToV210
Review URL: https://webrtc-codereview.appspot.com/859015

git-svn-id: http://libyuv.googlecode.com/svn/trunk@412 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=91
TEST=I420ToV210
Review URL: https://webrtc-codereview.appspot.com/859015

git-svn-id: http://libyuv.googlecode.com/svn/trunk@411 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=RGBAToARGB
Review URL: https://webrtc-codereview.appspot.com/868013

git-svn-id: http://libyuv.googlecode.com/svn/trunk@410 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=91
TEST=I420ToV210
Review URL: https://webrtc-codereview.appspot.com/857015

git-svn-id: http://libyuv.googlecode.com/svn/trunk@409 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=none
TEST=convert_test
Review URL: https://webrtc-codereview.appspot.com/857014

git-svn-id: http://libyuv.googlecode.com/svn/trunk@408 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=91
TEST=I420ToV210
Review URL: https://webrtc-codereview.appspot.com/872008

git-svn-id: http://libyuv.googlecode.com/svn/trunk@407 16f28f9a-4ce2-e073-06de-1de4eb20be90

BUG=91
TEST=I420ToV210 unittest
Review URL: https://webrtc-codereview.appspot.com/855013

git-svn-id: http://libyuv.googlecode.com/svn/trunk@406 16f28f9a-4ce2-e073-06de-1de4eb20be90