Improved function entry hook coverage

Adds more coverage for function entry hook, sufficient to capture profiles that are contiguous from C++, through JS and back out to C++.

R=danno@chromium.org

Committed: http://code.google.com/p/v8/source/detail?r=15361

Review URL: https://codereview.chromium.org/16578008

Patch from Sigurður Ásgeirsson <siggi@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15384 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Prepare push to trunk.  Now working on version 3.20.1.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18052019

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15385 ce2b1a6d-e550-0410-aec6-3dcde31c8c00