Remove hand placed BUNDLEALIGN and add new asm directives into
psuedo-instruction macros. Moving forward, this will make for easier and
more consistent psuedo-instruction alignment with bundle boundaries.
This is mostly a NaCl CL but does include a few changes that will slightly
change loop alignments in non-NaCl builds.
BUG=253
TEST=trybots,ncval
R=fbarchard@google.com

Review URL: https://webrtc-codereview.appspot.com/4889004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@913 16f28f9a-4ce2-e073-06de-1de4eb20be90