[PATCH] MachO-embedded: refactor Clang to use "*-*-unknown-macho" triple

[Tim Northover]

  Updated to new state after Christmas and implemented some of Rafael's suggestions.

Hi grosbach,

http://llvm-reviews.chandlerc.com/D2416

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2416?vs=6125&id=6369#toc

Files:
  lib/Basic/Targets.cpp
  lib/Driver/Driver.cpp
  lib/Driver/ToolChain.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  test/Driver/darwin-eabi.c
  test/Driver/darwin-embedded.c
  test/Driver/macho-embedded.c
  test/Preprocessor/macho-embedded-predefines.c
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