[turbofan] Introduce dedicated NumberConvertHoleNaN simplified operator.

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index 575b64a48780780ed4986df9eccf5f61b8d10c24..34c7df4ece93d01ea7ddee942a3d40543bb46331 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -805,21 +805,6 @@ Reduction JSTypedLowering::ReduceJSToLength(Node* node) {
 }
 
 Reduction JSTypedLowering::ReduceJSToNumberInput(Node* input) {
-  // Check for ToNumber truncation of signaling NaN to undefined mapping.
-  if (input->opcode() == IrOpcode::kSelect) {
-    Node* check = NodeProperties::GetValueInput(input, 0);
-    Node* vtrue = NodeProperties::GetValueInput(input, 1);
-    Type* vtrue_type = NodeProperties::GetType(vtrue);
-    Node* vfalse = NodeProperties::GetValueInput(input, 2);
-    Type* vfalse_type = NodeProperties::GetType(vfalse);
-    if (vtrue_type->Is(Type::Undefined()) && vfalse_type->Is(Type::Number())) {
-      if (check->opcode() == IrOpcode::kNumberIsHoleNaN &&
-          check->InputAt(0) == vfalse) {
-        // JSToNumber(Select(NumberIsHoleNaN(x), y:undefined, x:number)) => x
-        return Replace(vfalse);
-      }
-    }
-  }
   // Try constant-folding of JSToNumber with constant inputs.
   Type* input_type = NodeProperties::GetType(input);
   if (input_type->IsConstant()) {