[cfe-dev] Handling ignored calling conventions

[Aaron Ballman]

Here's the latest iteration of the patch; this time it pushes decision
making down into the TargetInfo subclasses to decide whether a given
calling convention is acceptable, and what the default calling
convention should be.

This patch also updates a lot of the test cases and clarifies the
target architecture for some of them (to ensure we're getting correct
test coverage).

~Aaron
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