Deprecate v8::V8::Pause/ResumeProfiler

The methods were added to the public API in r1185 when Chrome DevTools were using the same output as produced for tick processor when --prof option is specified.

I don't see any existing clients of these methods and since they add a noticeable complexity to the profiler code I'd like to remove them.

BUG=None
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/19591006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15828 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Introduce kRegisterSize, kPCOnStackSize and kFPOnStackSize constants

BUG=None
R=danno@chromium.org

Review URL: https://codereview.chromium.org/19802002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15829 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Avoid duplication of OS::Thread methods for every POSIX platform.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/19490010

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15830 ce2b1a6d-e550-0410-aec6-3dcde31c8c00