Change native RegExp call code to properly set C++ structures and

Change native RegExp call code to properly set C++ structures and
to handle exceptions on return from RegExp.

BUG=1108
TEST=

Committed: http://code.google.com/p/v8/source/detail?r=6794

[Lasse Reichstein, 2011-02-10 17:41:10]

Please check for the viability of the approach.
I'll do the same in X64 and ARM if it looks ok.

[Søren Thygesen Gjesse, 2011-02-11 08:18:53]

LGTM

http://codereview.chromium.org/6489001/diff/1/src/ia32/macro-assembler-ia32.h
File src/ia32/macro-assembler-ia32.h (right):

http://codereview.chromium.org/6489001/diff/1/src/ia32/macro-assembler-ia32.h...
src/ia32/macro-assembler-ia32.h:309: void Throw();
Throw -> Throw(Register object) for clarity?

[Lasse Reichstein, 2011-02-15 12:56:40]

Addressed comments, ported to X64 and ARM.

[Søren Thygesen Gjesse, 2011-02-15 13:22:03]

LGTM