Merged r10719 into 3.7 branch.

Ensure using byte registers for byte instructions on ia32 and x64.

BUG=v8:1945

R=jkummerow@chromium.org
TEST=

Review URL: https://chromiumcodereview.appspot.com/9415006

git-svn-id: http://v8.googlecode.com/svn/branches/3.7@10723 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
7 files changed