[PATCH] SemaCXX: Support templates in availability attributes

[Duncan P. N. Exon Smith via cfe-commits]

This patch adds support for templates in availability attributes.
  - If the context for an availability diagnostic is a
    `FunctionTemplateDecl`, look through it to the `FunctionDecl`.
  - Add `__has_feature(attribute_availability_in_templates)`.

Is there anything else I should be testing to be sure availability
works correctly in templates?  I'm working on a patch to add
availability markup to the libc++ headers, and this is the only
problem I've hit so far.  Anyone have thoughts on other things I
should test?

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