X87: Inline Math.fround in optimized code.

port r22665.

original commit message:
 Inline Math.fround in optimized code.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/429143003

Patch from Chunyang Dai <chunyang.dai@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22691 ce2b1a6d-e550-0410-aec6-3dcde31c8c00