Fix handle zapping interaction with NoHandleAllocation.

Fix handle zapping interaction with NoHandleAllocation.

This makes sure that closed handle scopes are properly zapped even if an
enclosing NoHandleAllocation shrunk the limit. It also unifies the code
that performs scope closing for internal and external handle scopes.

R=svenpanne@chromium.org
TEST=cctest/test-api/NestedLockersNoTryCatch

Committed: http://code.google.com/p/v8/source/detail?r=14876

[Sven Panne, 2013-05-29 10:58:12]

LGTM, but please include the fact that a test was fixed in the CL description,
making SW archaeology easier. ;-)

[Michael Starzinger, 2013-05-29 11:09:08]

Committed patchset #1 manually as r14876 (presubmit successful).