[turbofan] Initial version of number type feedback.

src/compiler/type-hint-analyzer.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/type-hint-analyzer.h"
 
 #include "src/assembler.h"
 #include "src/code-stubs.h"
 #include "src/compiler/type-hints.h"
 #include "src/ic/ic-state.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 namespace {
 
 // TODO(bmeurer): This detour via types is ugly.
 BinaryOperationHints::Hint ToHint(Type* type) {
   if (type->Is(Type::None())) return BinaryOperationHints::kNone;
   if (type->Is(Type::SignedSmall())) return BinaryOperationHints::kSignedSmall;
   if (type->Is(Type::Signed32())) return BinaryOperationHints::kSigned32;
-  if (type->Is(Type::Number())) return BinaryOperationHints::kNumber;
+  if (type->Is(Type::Number())) return BinaryOperationHints::kNumberOrUndefined;
   if (type->Is(Type::String())) return BinaryOperationHints::kString;
   return BinaryOperationHints::kAny;
 }
 
 }  // namespace
 
 
 bool TypeHintAnalysis::GetBinaryOperationHints(
     TypeFeedbackId id, BinaryOperationHints* hints) const {
   auto i = infos_.find(id);
@@ skipping 55 matching lines @@
         // Ignore the remaining code objects.
         break;
     }
   }
   return new (zone()) TypeHintAnalysis(infos);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8