Prepare push to trunk.  Now working on version 3.22.1.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23514075

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16887 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Document that its the job of the embedder to provide strong entropy for seeding the PRNG.

BUG=v8:2905
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/23965009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16888 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Let SetEntropySource() fail if called after V8::Initialize().

BUG=v8:2905
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/24357002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16889 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Move DumpBacktrace() to checks.cc and cleanup both the code and the necessary platform checks.

This also removes the platform-posix.h header file.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/23497009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16890 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
remove IsDeadCheck

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24280007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16893 ce2b1a6d-e550-0410-aec6-3dcde31c8c00