[PATCH] [AArch64] Implement Clang CLI interface proposal about "-march".

[Kevin Qin]

Hi,

Parts of codes are refactored to match this behavior.
"Where this option is used in conjunction with -march or -mtune, those options take precedence over the appropriate part of this option."

Regards,
Kevin

http://reviews.llvm.org/D4346

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  lib/Basic/Targets.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  test/CodeGen/arm_acle.c
  test/Driver/aarch64-cpus.c
  test/Driver/aarch64-mfpu.c
  test/Preprocessor/aarch64-target-features.c
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