Reduce imprecision of incremental marking.

Reduce imprecision of incremental marking.

Don't mark through caches that will be flushed by MarkCompactPrologue. Make caches sticky grey (don't push them on to the marking stack) to prevent the write-barrier or the marker from marking them.

Don't mark through weak links connecting global contexts.

Add tests that started failing after merge from the bleeding edge to mjsunit.status and cctests.status.

R=erik.corry@gmail.com
BUG=v8:1679
Committed: http://code.google.com/p/v8/source/detail?r=9253

[Erik Corry, 2011-09-13 07:07:44]

LGTM

http://codereview.chromium.org/7867040/diff/1/src/incremental-marking.cc
File src/incremental-marking.cc (right):

http://codereview.chromium.org/7867040/diff/1/src/incremental-marking.cc#newc...
src/incremental-marking.cc:683: MarkObjectGrey(ctx->normalized_map_cache());
Perhaps the fact that this routine does not push to the stack should be
reflected in its name.