[PATCH] Add '-mhle' option and pre-defined macros for HLE

[darkbuck]

  this patch is rebased onto trunk and revised after the change replacing target flags to HLE hint.

Hi hfinkel, eli.friedman, chandlerc, jfifield,

http://llvm-reviews.chandlerc.com/D441

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D441?vs=1057&id=1146#toc

Files:
  include/clang/Driver/Options.td
  lib/Basic/Targets.cpp
  lib/CodeGen/CGBuiltin.cpp
  lib/CodeGen/CGExpr.cpp
  test/Preprocessor/predefined-arch-macros.c
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