[turbofan] Initial version of number type feedback.

src/compiler/type-hint-analyzer.cc

Index: src/compiler/type-hint-analyzer.cc
diff --git a/src/compiler/type-hint-analyzer.cc b/src/compiler/type-hint-analyzer.cc
index da4f2683a301fc94b87f5fe5a02aaecb6bfe6eb2..89d674bae80e1bc3ec95aad26e1da23bbd856ceb 100644
--- a/src/compiler/type-hint-analyzer.cc
+++ b/src/compiler/type-hint-analyzer.cc
@@ -20,7 +20,7 @@ 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;
 }