[PATCH] clang-cl: Add support for the /o option for object files, executables, and preprocessor output

[Ehsan Akhgari]

Hi rnk,

cl.exe recognizes /o as a deprecated and undocumented option similar to
/Fe.  This patch adds support for this option to clang-cl for /Fe, /Fo
and /Fi.  It also ensures that the last option among /o and /F* wins,
if both specified.

This is required at least for building autoconf based software, since
autoconf uses -o to specify the executable output.

This fixes http://llvm.org/PR20894.

http://reviews.llvm.org/D5308

Files:
  include/clang/Driver/CLCompatOptions.td
  lib/Driver/Driver.cpp
  test/Driver/cl-outputs.c
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