Unbreak MSVC build by respecting explicit FmtElm constructor. This is

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1461 matching lines @@
   if (literal->IsString() && String::cast(*literal)->length() == 0) {
     return false;
   }
   return true;
 }
 
 void HConstant::PrintDataTo(StringStream* stream) {
   if (has_int32_value_) {
     stream->Add("%d ", int32_value_);
   } else if (has_double_value_) {
-    stream->Add("%lf ", double_value_);
+    stream->Add("%lf ", FmtElm(double_value_));
   } else {
     handle()->ShortPrint(stream);
   }
 }
 
 
 bool HArrayLiteral::IsCopyOnWrite() const {
   if (!boilerplate_object_->IsJSObject()) return false;
   return Handle<JSObject>::cast(boilerplate_object_)->elements()->map() ==
       HEAP->fixed_cow_array_map();
@@ skipping 1096 matching lines @@
 
 
 void HCheckPrototypeMaps::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal