[PATCH] [ARM] Add armv6s[-]m as an alias to armv6[-]m

[Jonathan Roelofs]

Please add a tests in:

  llvm/test/CodeGen/ARM/build-attributes.ll
  llvm/test/MC/ARM/arm-thumb-cpus.s


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7504

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