use aapcs-vfp calling convention on ARMv7

Change-Id: I125eefe96d6b813e79b9040bd89be81c32669789
Reviewed-on: https://skia-review.googlesource.com/117240
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed