[PATCH] Automated handling of language options for attributes

[Aaron Ballman]

Several attributes test whether specific language options are enabled
before performing the required semantic handling. This patch automates
that task by pushing it into tablegen.

I've added a list of language options that can be optionally specified
for an attribute. If none of the given language options are enabled, a
diagnostic is issued. This allowed several attributes to use the
simple attribute handler.

~Aaron
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