Reland exception propagation fix....

Reland exception propagation fix.

Fix exception propagation problem where undefined was returned instead
of an empty handle in case of an exception.  This problem can break
C++ programs that are not interested in catching exceptions and just
want to propagate them out by testing for empty handles.

The issue is that exceptions are not rescheduled if they are
externally caught.  Externally caught exceptions have to be
rescheduled if there is a JavaScript frame on the way to the C++ frame
that holds the external handler.

A couple of tests will fail on the ARM simulator because the simulator
has separate stacks for C++ and JavaScript.  I have marked the tests
as failing only on the simulator.

Committed: http://code.google.com/p/v8/source/detail?r=1657

[Søren Thygesen Gjesse, 2009-03-31 12:58:33]

LGTM

http://codereview.chromium.org/56105/diff/1/4
File tools/test.py (right):

http://codereview.chromium.org/56105/diff/1/4#newcode1265
Line 1265: 'simulator': options.simulator
Is this to "replace" -S simulator=arm?