[cfe-commits] Reduce exception handling use in TableGen

[Joerg Sonnenberger]

Hi all,
the attached patch removes the majority of the exception handling
dependency in TableGen. There is a small regression in the quality of
error messages in one code path of the SetTheory implementation, where
the location of the original expression is lost. This is a bit difficult
to fix since the functions involved can be accessed directly as well and
I am not sure how much value the location adds here.

I have also included the parts needed for Clang, but those are
unproblematic.

One piece is missing and that's CodeGenDAGPatterns.cpp. That one
actually uses the unwinding and resume behavior of exceptions to silence
errors, I will bring up patches for that separately.

Joerg
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