[cfe-commits] [PATCH] Point back at the callsite when emitting a warning about a format string

[Matt Beaumont-Gay]

Fixes PR9751. Any other expression kinds we should look through in
NoteCallLocation? I'm a little unhappy with the pile of dyn_cast<>s
stolen from Sema::SemaCheckStringLiteral for handling format_arg
functions, but I don't think it's worth pulling them out into a
helper.

-Matt
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