[llvm-commits] Reduce exception handling use in TableGen

[Joerg Sonnenberger]

Hi all,
this is the second version of the patch. A small part already went into
the tree (PrintFatalError and the clang changes, except
CMakeLists.txt/Makefile).

The one really nasty part of this change is CodeGenDAGPattern.cpp. I've
changed the TreePattern code to provide a sticky marker. The first error
hit during the resolution process is printed and it tries to bail out
from that. I am not completely sure if the current logic is aggressive
enough or whether hasError() checks are needed in a few more cases.
Since this only matters for at least somewhat broken specifications, it
shouldn't be a problem to add more checks as needed.

Joerg
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