[cfe-commits] [PATCH][cl.exe compatible driver] Add DriverKind to Driver.

[Michael Spencer]

After a discussion with Daniel on IRC, I've decided to implement
driver modes as a part of Driver for now. If things get too
complicated, we can refactor into separate classes. But it seems that
the majority of the code will be confined to parsing and translating
options instead of spread throughout the code.

I would have liked to set the DriverKind in the constructor and have
it be immutable after that, but ParseProgName doesn't currently work
that way.

- Michael Spencer
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