[cfe-commits] [patch] Add a llvm::Triple::CPUArch enum

[Rafael Espíndola]

There is a lot of char* being passed around in the clang driver. At
least part of that seems to be because we have an enum
(llvm::Triple::ArchType) that can distinguish  an ARM from an X86, but
we don't have an enum that can distinguish a ARMv6 form an ARMv7 for
example.

The attached patches add the enum llvm::Triple::CPUArch and use that
to replace a long if chain in clang. I think it can be used in more
places, but this should be sufficient to illustrate the idea.

Cheers,
Rafael
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