patch: new warning on ODR-use of undefined inline functions

[Nick Lewycky]

This patch extends the tracking for used but undefined functions and
variables with internal linkage to also apply to inline functions.
Sema::UndefinedInternals is renamed Sema::UndefinedButUsed.

Fixes PR14993. Please review! Please pay particular attention to the
behaviour of the error under C99 and GNU89 modes.

Also, there's a comment that these should be errors. That turned out to not
be entirely trivial due to some codegen tests, so it's left out of this
patch.

Nick
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