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

[Renato Golin]

  Hi Tim,

  I suppose none-eabi produces ELF by default, and there's no way of changing the object format.

  I particularly don't like the use of {ELF,MACH} + {*ABI*} on the same namespace, but that's there already and it's not going to change soon, so, I won't go down that route.

  About the changes in the Driver, I'm not the best person to review them...

  cheers,
  --renato

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