Richard Smith 16e1b07597 Rather than duplicating extension diagnostics to allow them to cause a ...

substitution failure, allow a flag to be set on the Diagnostic object,
to mark it as 'causes substitution failure'.

Refactor Diagnostic.td and the tablegen to use an enum for SFINAE behavior
rather than a bunch of flags.

llvm-svn: 194444

2013-11-12 02:41:45 +00:00

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