[rfc] exception handling in gimple

[Richard Henderson <rth at redhat dot com>]

I've yet to write the ChangeLog entry, and I'm just
re-running the build test cycle after resolving some
merge errors with Matz's last gimple expanson patch,
but I think this patch is pretty close to done.

The previous test run, with vta merge included, had
no C++ regressions, 2 Ada failures that I don't believe
were regressions, and 2 Java failures that I didn't
get around to examining.

I've tested sjlj support as well; there are 10 Ada
regressions wrt dwarf2 that need to be examined, but
there were no C++ regressions, so it's in fairly good
shape.

So this is well beyond the WIP stage, and I'd like
to get some real feedback on it.


r~

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