[PATCH] clang-cl: Implement the -arch flag

[Ehsan Akhgari]

Addressed the review comments.

http://reviews.llvm.org/D4519

Files:
  include/clang/Driver/CLCompatOptions.td
  lib/Driver/Tools.cpp
  test/Driver/cl-options.c
  test/Driver/cl-x86-flags.c
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