[PATCH] Allow case-insensitive values for -mcpu for ARM in line with GCC.

[Gabor Ballabas]

Changes in this version:

- Change StringRef to std::string in getARMTargetCPU callers to avoid possible memory corruptions.
- Remove unnecessary CHECK line from test/Driver/krait-cpu.c.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10162

Files:
  lib/Driver/ToolChain.cpp
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/arm-cortex-cpus.c
  test/Driver/krait-cpu.c

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