[turbofan] Properly support Number feedback for binary operators.

src/type-hints.cc

Index: src/type-hints.cc
diff --git a/src/type-hints.cc b/src/type-hints.cc
index 233d03e48e2f9f8880f04126976f8f8c479a2abd..e48c8bdb21cbbf3e605f305d02fcf99f61d9aa7b 100644
--- a/src/type-hints.cc
+++ b/src/type-hints.cc
@@ -15,6 +15,8 @@ std::ostream& operator<<(std::ostream& os, BinaryOperationHint hint) {
       return os << "SignedSmall";
     case BinaryOperationHint::kSigned32:
       return os << "Signed32";
+    case BinaryOperationHint::kNumber:
+      return os << "Number";
     case BinaryOperationHint::kNumberOrOddball:
       return os << "NumberOrOddball";
     case BinaryOperationHint::kString: