Fix a bug in the regexp caching. Also add a few more places to...

Fix a bug in the regexp caching.  Also add a few more places to
cache.  We now cache most of the places where Opera cache and
one or two where they do not cache for some reason.  Since
these optimizations aren't necessarily useful on real code we
may remove them if and when the Dromaeo website makes the
benchmarks harder to game.

Committed: http://code.google.com/p/v8/source/detail?r=4157

[Mads Ager (chromium), 2010-03-17 10:22:23]

LGTM

http://codereview.chromium.org/995005/diff/1/4
File test/mjsunit/regexp-cache-replace.js (right):

http://codereview.chromium.org/995005/diff/1/4#newcode1
test/mjsunit/regexp-cache-replace.js:1: // Copyright 2009 the V8 project
authors. All rights reserved.
2010