[PATCH] Fix DiagnosticErrorTrap with SuppressAllDiagnostics

[Brad King]

Hi Folks,

On 11/20/2014 09:27 AM, Brad King wrote [1]:
> SuppressAllDiagnostics prevents DiagnosticErrorTrap from working
> so any analysis in Clang that uses traps fails to work correctly.

Here is a patch that fixes this problem and adds a test covering the
use case.  See commit message in the patch file for details.  I've
tested it on r222772.

Thanks,
-Brad

[1] http://thread.gmane.org/gmane.comp.compilers.clang.scm/110832/focus=112180
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