[turbofan] Improve representation selection for HeapObject checking.

src/compiler/simplified-operator.h

Index: src/compiler/simplified-operator.h
diff --git a/src/compiler/simplified-operator.h b/src/compiler/simplified-operator.h
index 901addcb0255f0d7f5834c8c0c9ac271bb6c6826..4ba6d589842737fec413fb93e52ecc5d073d4997 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -309,6 +309,7 @@ class V8_EXPORT_PRIVATE SimplifiedOperatorBuilder final
   const Operator* ChangeInt32ToTagged();
   const Operator* ChangeUint32ToTagged();
   const Operator* ChangeFloat64ToTagged();
+  const Operator* ChangeFloat64ToTaggedPointer();
   const Operator* ChangeTaggedToBit();
   const Operator* ChangeBitToTagged();
   const Operator* TruncateTaggedToWord32();
@@ -339,6 +340,7 @@ class V8_EXPORT_PRIVATE SimplifiedOperatorBuilder final
   const Operator* CheckedTaggedToInt32(CheckForMinusZeroMode);
   const Operator* CheckedTaggedToFloat64(CheckTaggedInputMode);
   const Operator* CheckedTaggedToTaggedSigned();
+  const Operator* CheckedTaggedToTaggedPointer();
   const Operator* CheckedTruncateTaggedToWord32();
 
   const Operator* CheckFloat64Hole(CheckFloat64HoleMode);