[turbofan] Lower ConsString creation in JSTypedLowering.

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 05b4e153998d1e349c89439449bcab68f8660d29..2df2b280d9f01a2c5fb99f2a6c9e3601dc42ef28 100644
--- a/src/compiler/type-hint-analyzer.cc
+++ b/src/compiler/type-hint-analyzer.cc
@@ -29,6 +29,7 @@ BinaryOperationHint ToBinaryOperationHint(Token::Value op,
     case BinaryOpICState::NUMBER:
       return BinaryOperationHint::kNumberOrOddball;
     case BinaryOpICState::STRING:
+      return BinaryOperationHint::kString;
     case BinaryOpICState::GENERIC:
       return BinaryOperationHint::kAny;
   }