Avoid fallback to weak entropy for the PRNGs on Windows.

Add fallback to rand_s() to gather entropy on Windows for
seeding the random number generator. This is compatible
with what Blink does.

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

Review URL: https://codereview.chromium.org/24315007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16920 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Scripts should not care about closed tree when committing.

I just got bitten by this when merging to branch.

R=jkummerow@chromium.org, machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24254005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16921 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Flush recompile jobs on last-resort GC.

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24145011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00