[cfe-dev] [PATCH] Apply calling conventions to function types

[Charles Davis]

My last patch allows function types to hold a calling convention. This
patch has Sema actually apply them if a calling-convention attribute is
present.

It also fixes some issues with the last patch:
- Calling conventions are now printed in the TypePrinter.
- The calling convention is now factored into the FoldingSetNode ID.

I'm posting it here because there's something really wrong with it.
Specifically, trying to apply the cdecl calling convention to a function
pointer type fails miserably. Interestingly enough, the function type,
when canonicalized, is not actually canonical.

NOTE: To fully understand what's going on, you might need to look at r93726.

Chip
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