Add support for VCCLCompilerTool EnableEnhancedInstructionSet setting.

test/win/compiler-flags/enable-enhanced-instruction-set.cc

Index: test/win/compiler-flags/enable-enhanced-instruction-set.cc
diff --git a/test/win/compiler-flags/enable-enhanced-instruction-set.cc b/test/win/compiler-flags/enable-enhanced-instruction-set.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2491f160a1213b1ac80209944901bbfe8f2b0e04
--- /dev/null
+++ b/test/win/compiler-flags/enable-enhanced-instruction-set.cc
@@ -0,0 +1,26 @@
+// Copyright (c) 2014 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <stdio.h>
+
+static const char* GetArchOption() {
+#if _M_IX86_FP == 0
+  return "IA32";
+#elif _M_IX86_FP == 1
+  return "SSE";
+#elif _M_IX86_FP == 2
+#  if !defined(__AVX__)
+  return "SSE2";
+#  else
+  return "AVX";
+#  endif
+#else
+  return "UNSUPPORTED OPTION";
+#endif
+}
+
+int main() {
+  printf("/arch:%s\n", GetArchOption());
+  return 0;
+}