Daniel Dunbar 3d45e17d15 Driver: Add a Tool::hasGoodDiagnostics hook, and use it to simplify logic for ...

deciding when we need to emit an extra "command failed" diagnostic.
 - This also fixes the case where we were emitting that extra diagnostics, even
   when using clang w/ the integrated assembler, which has good diagnostics.

llvm-svn: 100529

2010-04-06 17:07:49 +00:00

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