[PATCH] Removing the "specialness" from thread-safety attribute parsing

[Aaron Ballman]

The thread safety attributes get a bit of special treatment hard-coded
into the parser which this patch removes. Specifically, some
thread-safety attributes are allowed to appear on function definitions
when late parsed even though they have a GNU-style attribute spelling
and that's usually disallowed.

This patch removes that "specialness" by making it a declarative
construct in Attr.td; there's a new attribute subject node called
FunctionDefinition which is treated as a FunctionDecl for diagnostic
purposes, but passes information along to the AttributeList object so
that it understands it can appear on a function definition. This is
then used in the places where IsThreadSafetyAttribute was being used.

~Aaron
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