[patch, clang-cl] Implement /Zc:trigraphs support, disable trigraphs by default

[Nico Weber]

Hi,

the attached patch disables trigraphs by default in clang-cl mode. To do
so, I'm renaming the cc1 trigraph flag to -ftrigraphs, and I'm adding a
-fno-trigraphs flag. (This requires updating a handful of cc1 tests, and
translating -trigraphs to -ftrigraphs in the driver.)

The driver grows parsing logic for /Zc:, everything other than trigraphs is
ignored for now. (We probably want to implement at least /Zc:inline at some
point, which is why I added parsing code for this instead of always sending
-fno-trigraphs to cc1 in clang-cl mode.)

Ok?

Nico
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