[patch] Check for isDiagnosticEnabled even if we have a dig handler

[Rafael Espíndola]

> RespectDiagnosticFilters does look like more flexibility than
> necessary, but that is independent. I will try writing a patch to see
> what breaks.

And yes, it breaks clang. The issue is that clang expects to be passed
all the remarks and to do its own filtering for -Rpass.

Diego, do you remember why it was implemented like that? The filtering
looks duplicated with the one in LLVM. Couldn't clang just pass the
pattern down to LLVM?

For reference, the patch I had in mind is attached.


Cheers,
Rafael
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