Revert "Turn the NumberToStringStub into a hydrogen stub."

This reverts commit 16874 for breaking the tests.

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/23440064

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16876 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
remove Isolate::GetCurrent from Context api functions

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24345003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16877 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
move CopyablePersistentTraits to v8.h

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24356002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16880 ce2b1a6d-e550-0410-aec6-3dcde31c8c00