[turbofan] Lower ConsString creation in JSTypedLowering.

src/compiler/type-hints.cc

Index: src/compiler/type-hints.cc
diff --git a/src/compiler/type-hints.cc b/src/compiler/type-hints.cc
index a07a8707b127937fd6e1961c5d8f3bb5b1841d90..32e4486a52b9a859eed81978217384fdd2d553ab 100644
--- a/src/compiler/type-hints.cc
+++ b/src/compiler/type-hints.cc
@@ -18,6 +18,8 @@ std::ostream& operator<<(std::ostream& os, BinaryOperationHint hint) {
       return os << "Signed32";
     case BinaryOperationHint::kNumberOrOddball:
       return os << "NumberOrOddball";
+    case BinaryOperationHint::kString:
+      return os << "String";
     case BinaryOperationHint::kAny:
       return os << "Any";
   }