[cfe-dev] Pushable #pragma diagnostics

[Louis Gerbarg]

Okay, here is a cleaned up version of the patch. I ended up moving the
push/pop into the Diagnostic class (just pushing and popping the
DiagMappings), since pushing the entire Diagnostic objects resulted in
issues with losing DiagClients. This patch includes some new test
cases for the feature, and passes all existing test cases.

Louis
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