Buildbot failure on windows

[jahanian]

r176726 is causing multiple test failures on Window’s buildbot.

Failing Tests (7):
      Clang :: Driver/B-opt.c
      Clang :: Driver/cross-linux-tools.c
      Clang :: Driver/gcc-toolchain.cpp
      Clang :: Driver/linux-ld.c
      Clang :: Driver/mips-cs-ld.c
      Clang :: Driver/montavista-gcc-toolchain.c
      Clang :: Preprocessor/iwithprefix.c

Command 1: "FileCheck" "--check-prefix=CHECK-B-OPT-TRIPLE" “C:...\src\tools\clang\test\Driver\B-opt.c"
  Command 1 Result: 1
  Command 1 Output:
  
  
  Command 1 Stderr:
  C:...\src\tools\clang\test\Driver\B-opt.c:6:24: error: expected string not found in input
  // CHECK-B-OPT-TRIPLE: "{{.*}}/Inputs/B_opt_tree/dir1/i386-unknown-linux-ld"
                         ^
  <stdin>:1:2: note: scanning from here
   clang version 3.4 (based on LLVM 3.4svn)
   ^

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