[cfe-commits] [PATCH] Refactor Diagnostic class

[Argyrios Kyrtzidis]

-The attached patch separates Diagnostic class into 2 classes, Diagnostic and DiagnosticIDs.
-Move the stuff of Diagnostic related to creating/querying diagnostic IDs into the new DiagnosticIDs class.
-DiagnosticIDs can be shared among multiple Diagnostics for multiple translation units.
-The rest of the state in Diagnostic object is considered related and tied to one translation unit.
-Have Diagnostic point to the SourceManager that is related with. Diagnostic can now accept just a SourceLocation instead of a FullSourceLoc.
-Reflect the changes to various interfaces.

Please review.

-Argiris

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