[PATCH] Replace string GNU Triples with llvm::Triple in InitMCObjectFileInfo. NFC.

[Daniel Sanders]

Committed with a small fix in r239721. It turns out that GetTarget() in llvm-mc can potentially replace the triple and this showed up in one of the Mips EH tests.
Also made the trivial change to clang in the same commit to avoid breaking -Werror builds.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10366

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/