Merge bleeding edge into the GC branch up to 7948. The asserts

Merge bleeding edge into the GC branch up to 7948.  The asserts
around generating stubs while generating stubs have been beefed
up on the bleeding edge, which exposed a major bug in the way we
are doing this on the GC branch.  That assert has been disabled
for now, but must be fixed asap.
Committed: http://code.google.com/p/v8/source/detail?r=8027

[Lasse Reichstein, 2011-05-23 12:57:30]

LGTM, Rubberstamped.
If it compiles, it works ... or was that SML, not C++?