Fix assert triggered in fast/regex/pcre-test-4.html We were not filtering out

Fix assert triggered in fast/regex/pcre-test-4.html We were not filtering out
all the nodes that had non-ASCII characters.  That has been fixed, but because
of the protection against over-deep recursion when filtering it is wrong to
assert that all nodes were filtered.  This change therefore also makes sure we
can cope with non-filtered nodes by adding back some code removed in
https://chromiumcodereview.appspot.com/10174017/
Committed: https://code.google.com/p/v8/source/detail?r=11487

[ulan, 2012-05-03 08:18:45]

LGTM with comments.

https://chromiumcodereview.appspot.com/10358008/diff/1/src/jsregexp.cc
File src/jsregexp.cc (right):

https://chromiumcodereview.appspot.com/10358008/diff/1/src/jsregexp.cc#newcod...
src/jsregexp.cc:2432: // matching can turn an ASCII character into non-ASCII or
Tabs and trailing spaces in this block.