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

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

Index: test/win/compiler-flags/enable-enhanced-instruction-set.cc
===================================================================
--- test/win/compiler-flags/enable-enhanced-instruction-set.cc	(revision 2027)
+++ test/win/compiler-flags/enable-enhanced-instruction-set.cc	(working copy)
@@ -12,8 +12,10 @@
 #elif _M_IX86_FP == 2
 #  if !defined(__AVX__)

[bradn, 2015/01/23 18:31:08]

FWIW, might be clearer if these were stated in the positive and in reverse, but
either way.

[Nico, 2015/01/23 18:31:44]

That's a great suggestion, done.

   return "SSE2";
+#  elif !defined(__AVX2__)
+  return "AVX";
 #  else
-  return "AVX";
+  return "AVX2";
 #  endif
 #else
   return "UNSUPPORTED OPTION";