Add hyperthread detection on Mac OS X. #4516
Version history for hyperthread detection on Mac OS X. #4516
Add hyperthread detection on Mac OS X. #4516
Merge branch 'V8_2_2-branch' into V8_2-branch
Merge branch 'V8_2-branch' into V8_3_0-branch
Merge branch 'V8_3_0-branch'