Skip regress-crbug-137689.js when running with GC stress

It depends on maps not disappearing prematurely.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/720853002

Cr-Commit-Position: refs/heads/master@{#25302}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25302 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix Context::declaration_context to account for script contexts.

R=rossberg@chromium.org
BUG=v8:3690
LOG=N

Review URL: https://codereview.chromium.org/715263003

Cr-Commit-Position: refs/heads/master@{#25303}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25303 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Leaving a generator via an exception causes it to close.

Port 757f400246dc45f889cdc0848094c417e44b8854
Port r25297

BUG=v8:3096
LOG=Y
R=paul.lind@imgtec.com

Review URL: https://codereview.chromium.org/716183004

Cr-Commit-Position: refs/heads/master@{#25304}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25304 ce2b1a6d-e550-0410-aec6-3dcde31c8c00