[patch] Support .warning directive in integrated assembler

[Nico Weber]

Hi,

the attached patch adds support for `.warning "optional string"`, PR20428.
Ok?

Like I said on the bug, it would be a nice-to-have if there'd be some clang
driver option to disable .warning warnings, like there is for #warning
preprocessor lines. I didn't see any infrastructure for dispatching
warnings from the assembler layer to the clang driver layer though – did I
just miss that? If not, are there plans to add something like that?

Thanks,
Nico
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