Fix leak in cctest/test-heap/ReleaseStackTraceData

TBR=svenpanne@chromium.org
BUG=none
LOG=n

Review URL: https://codereview.chromium.org/585843002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24068 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
The --optimize-for-size flag should imply a small semi-space

R=hpayer@chromium.org, mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/585523002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24069 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
X87: When serializer is enalbed, we disable the X87 stack check to reduce the code size.

     The reason is that the big code size will leads to test-serialize test cases fail
     when debug mode and snapshot=off.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/582373002

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

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24070 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix type in idle time undershot histogram name

TBR=hpayer@chromium.org
LOG=n
BUG=none

Review URL: https://codereview.chromium.org/587563003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24071 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Hack representation inference to assume current behavior of float32 loads and stores, which include implicit representation changes.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/576973003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24072 ce2b1a6d-e550-0410-aec6-3dcde31c8c00