fix for warning on ios 64 bit that int width doesnt match %2 size which is 64…

fix for warning on ios 64 bit that int width doesnt match %2 size which is 64 bit by default.  change size to explicitely 32 bit with %w2.
BUG=437
TESTED=try bots
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/49279004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1397 16f28f9a-4ce2-e073-06de-1de4eb20be90

source/compare_neon64.cc

@@ -32,7 +32,7 @@ uint32 SumSquareError_NEON(const uint8* src_a, const uint8* src_b, int count) {
     "ld1        {v0.16b}, [%0], #16            \n"
     MEMACCESS(1)
     "ld1        {v1.16b}, [%1], #16            \n"
-    "subs       %2, %2, #16                    \n"
+    "subs       %w2, %w2, #16                  \n"
     "usubl      v2.8h, v0.8b, v1.8b            \n"
     "usubl2     v3.8h, v0.16b, v1.16b          \n"
     "smlal      v16.4s, v2.4h, v2.4h           \n"