[PATCH] [ARM] Reject invalid -march values

[John Brawn]

Hi rengolin,

Restructure Triple::getARMCPUForArch so that invalid values will return nullptr, while retaining the behaviour that an argument specifying no particular architecture version will give a default CPU. This will be used by clang to give an error on invalid -march values.

Also restructure the extraction of the architecture version from the MArch string a little to hopefully make what it's doing clearer.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9599

Files:
  lib/Support/Triple.cpp
  unittests/ADT/TripleTest.cpp

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