[PATCH] Add support for -funsigned-bitfields

[Artyom Skrobov]

Hello,

The attached patch adds the support for -funsigned-bitfields and
-fsigned-bitfields command-line options, as available in GCC.

Regarding the implementation: DeclSpec::TypeSpecSign for a bitfield was not
accessible directly via the FieldDecl, so it took a bit of plumbing-through.

OK to commit?
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