Properly consider Double inputs for representation inference

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 691620921a94e0ca723b151655a82c391b5dfd96..9ce7498a32f564c990bc48f986061c0b5dc77233 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2248,12 +2248,10 @@ Representation HBinaryOperation::RepresentationFromInputs() {
   Representation left_rep = left()->representation();
   Representation right_rep = right()->representation();
 
-  if (left_rep.is_more_general_than(rep) &&
-      left()->CheckFlag(kFlexibleRepresentation)) {
+  if (left_rep.is_more_general_than(rep) && !left_rep.IsTagged()) {
     rep = left_rep;
   }
-  if (right_rep.is_more_general_than(rep) &&
-      right()->CheckFlag(kFlexibleRepresentation)) {
+  if (right_rep.is_more_general_than(rep) && !right_rep.IsTagged()) {
     rep = right_rep;
   }
   // Consider observed output representation, but ignore it if it's Double,