[patch] Forward all -f* options to -cc1

[Rafael Espíndola]

This is the first patch for trying to implement a regular treatment of
-f/-fno- options. It just forwards all -f options to -cc1 and, for
now, produces a more specific error in -cc1.

The next step is to add a .td file with flags and tablegen it to an
enum and an feature parser that returns one of the enums. Using that
parseFFlagOptions should then be able to, still manually, set the
appropriate bits in the *Options objects.

Cheers,
Rafael
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