[PATCH] Adding a -fno-math-builtin option to the compiler frontend (-cc1)

[Eli Bendersky]

Following our discussion in a separate thread, this patch adds the
-fno-math-builtin flag to -cc1, with a test. There's also a bit of
refactoring of Builtin::Context::InitializeBuiltins because the condition
there got too hairy.

PTAL

Thanks in advance,
Eli
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