delete eternal handle blocks correctly

TBR=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/22371002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16063 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Prepare push to trunk.  Now working on version 3.20.14.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/22277006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16064 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Return start/end profiling time in microseconds instead of milliseconds

The start and end time are now measured in microseconds and the type is int64_t.
This way it seems more natural as we are going to support submilisecond sampling
rate soon. Also it fixes cctest/test-cpu-profiler/ProfileStartEndTime test
failure caused by comparison between long double and double.

TEST=cctest/test-cpu-profiler/ProfileStartEndTime
BUG=v8:2824
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/22155003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16067 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix DeferredInstanceMigration to store the result to temp rather than temp to result.

Thanks to Akos Palfi for finding the bug.

BUG=
R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/22388002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16068 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Use standard routine to compute pointer hashs in heap profiler

BUG=None
R=alph@chromium.org, yangguo@chromium.org

Review URL: https://codereview.chromium.org/22300005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16069 ce2b1a6d-e550-0410-aec6-3dcde31c8c00