win: 'EnableEnhancedInstructionSet': '5' now enables /arch:AVX2.

test/win/gyptest-cl-enable-enhanced-instruction-set.py

 #!/usr/bin/env python
 
 # 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.
 
 """
 Test VCCLCompilerTool EnableEnhancedInstructionSet setting.
 """
 
@@ skipping 10 matching lines @@
 
   test.build('enable-enhanced-instruction-set.gyp', test.ALL, chdir=CHDIR)
 
   test.run_built_executable('sse_extensions', chdir=CHDIR,
                             stdout='/arch:SSE\n')
   test.run_built_executable('sse2_extensions', chdir=CHDIR,
                             stdout='/arch:SSE2\n')
 
   # /arch:AVX introduced in VS2010, but MSBuild support lagged until 2012.
   if os.path.exists(test.built_file_path('avx_extensions')):
-    test.run_built_executable('no_extensions', chdir=CHDIR,
+    test.run_built_executable('avx_extensions', chdir=CHDIR,
                               stdout='/arch:AVX\n')
 
   # /arch:IA32 introduced in VS2012.
   if os.path.exists(test.built_file_path('no_extensions')):
     test.run_built_executable('no_extensions', chdir=CHDIR,
                               stdout='/arch:IA32\n')
 
+  # /arch:AVX2 introduced in VS2013r2.
+  if os.path.exists(test.built_file_path('avx2_extensions')):
+    test.run_built_executable('avx2_extensions', chdir=CHDIR,
+                              stdout='/arch:AVX2\n')
+
   test.pass_test()