[turbofan] Remove redundant cmp operands swap.

Remove redundant operands swap for compare operation.

BUG=

Review-Url: https://codereview.chromium.org/2507683002
Cr-Commit-Position: refs/heads/master@{#41385}

src/compiler/ia32/instruction-selector-ia32.cc

@@ -1352,11 +1352,6 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
         cont);
   }
 
-  if (g.CanBeBetterLeftOperand(right)) {
-    if (!node->op()->HasProperty(Operator::kCommutative)) cont->Commute();
-    std::swap(left, right);
-  }
-
   return VisitCompare(selector, opcode, left, right, cont,
                       node->op()->HasProperty(Operator::kCommutative));
 }

src/compiler/x64/instruction-selector-x64.cc

@@ -1783,11 +1783,6 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
                                          g.UseRegister(right), cont);
   }
 
-  if (g.CanBeBetterLeftOperand(right)) {
-    if (!node->op()->HasProperty(Operator::kCommutative)) cont->Commute();
-    std::swap(left, right);
-  }
-
   return VisitCompare(selector, opcode, left, right, cont,
                       node->op()->HasProperty(Operator::kCommutative));
 }