Revert of [turbofan] Better representation selection for comparison with Float64.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 4af401df5c42a1239a387436b1d8fc96ec8866ee..e017f1d2e401de0e193d9b32fb6654a003728a07 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -699,11 +699,6 @@
     DCHECK_EQ(2, node->op()->ValueInputCount());
     return GetUpperBound(node->InputAt(0))->Is(type) &&
            GetUpperBound(node->InputAt(1))->Is(type);
-  }
-
-  bool IsNodeRepresentationFloat64(Node* node) {
-    MachineRepresentation representation = GetInfo(node)->representation();
-    return representation == MachineRepresentation::kFloat64;
   }
 
   bool IsNodeRepresentationTagged(Node* node) {
@@ -1624,15 +1619,6 @@
                 ChangeToPureOp(
                     node, changer_->TaggedSignedOperatorFor(node->opcode()));
 
-              } else if (IsNodeRepresentationFloat64(lhs) ||
-                         IsNodeRepresentationFloat64(rhs)) {
-                // If one side is already a Float64, it's pretty expensive to
-                // do the comparison in Word32, since that means we need a
-                // checked conversion from Float64 to Word32. It's cheaper to
-                // just go to Float64 for the comparison.
-                VisitBinop(node, UseInfo::CheckedNumberAsFloat64(),
-                           MachineRepresentation::kBit);
-                ChangeToPureOp(node, Float64Op(node));
               } else {
                 VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint),
                            MachineRepresentation::kBit);