Fix maybe_string_add for adds that have no type feedback where --always-opt is on.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 3acf0e99c2b43c59e8a554a795346068055ed549..d6cbc1444ad52eac67ab0f98ecd35f3a8e3943ae 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -10398,12 +10398,9 @@ HValue* HGraphBuilder::BuildBinaryOperation(
     Add<HDeoptimize>(
         Deoptimizer::kInsufficientTypeFeedbackForLHSOfBinaryOperation,
         Deoptimizer::SOFT);
-    // TODO(rossberg): we should be able to get rid of non-continuous
-    // defaults.
     left_type = Type::Any(zone());
-  } else {
-    if (!maybe_string_add) left = TruncateToNumber(left, &left_type);
     left_rep = Representation::FromType(left_type);
+    maybe_string_add = op == Token::ADD;
   }
 
   if (!right_type->IsInhabited()) {
@@ -10411,9 +10408,13 @@ HValue* HGraphBuilder::BuildBinaryOperation(
         Deoptimizer::kInsufficientTypeFeedbackForRHSOfBinaryOperation,
         Deoptimizer::SOFT);
     right_type = Type::Any(zone());
-  } else {
-    if (!maybe_string_add) right = TruncateToNumber(right, &right_type);
     right_rep = Representation::FromType(right_type);
+    maybe_string_add = op == Token::ADD;
+  }
+
+  if (!maybe_string_add) {
+    left = TruncateToNumber(left, &left_type);
+    right = TruncateToNumber(right, &right_type);
   }
 
   // Special case for string addition here.