Revert of [turbofan] Introduce LoadFunctionPrototype simplified operator.

src/compiler/effect-control-linearizer.cc

Index: src/compiler/effect-control-linearizer.cc
diff --git a/src/compiler/effect-control-linearizer.cc b/src/compiler/effect-control-linearizer.cc
index 70b297da0d2a1377c400b910eca7672f8ad80cbe..b0158525723ee21ea7de1f8d0345a7ea5b820099 100644
--- a/src/compiler/effect-control-linearizer.cc
+++ b/src/compiler/effect-control-linearizer.cc
@@ -784,9 +784,6 @@
     case IrOpcode::kStoreTypedElement:
       state = LowerStoreTypedElement(node, *effect, *control);
       break;
-    case IrOpcode::kLoadFunctionPrototype:
-      state = LowerLoadFunctionPrototype(node, *effect, *control);
-      break;
     case IrOpcode::kFloat64RoundUp:
       state = LowerFloat64RoundUp(node, *effect, *control);
       break;
@@ -3274,50 +3271,6 @@
       storage, index, value, effect, control);
 
   return ValueEffectControl(nullptr, effect, control);
-}
-
-EffectControlLinearizer::ValueEffectControl
-EffectControlLinearizer::LowerLoadFunctionPrototype(Node* node, Node* effect,
-                                                    Node* control) {
-  Node* function = node->InputAt(0);
-
-  // Load the {JSFunction::prototype-or-initial-map} field.
-  Node* function_prototype_or_initial_map = effect =
-      graph()->NewNode(simplified()->LoadField(
-                           AccessBuilder::ForJSFunctionPrototypeOrInitialMap()),
-                       function, effect, control);
-  Node* function_prototype_or_initial_map_map = effect =
-      graph()->NewNode(simplified()->LoadField(AccessBuilder::ForMap()),
-                       function, effect, control);
-
-  // Check if the {function} has an initial map.
-  Node* check0 = graph()->NewNode(
-      machine()->WordEqual(), function_prototype_or_initial_map_map,
-      jsgraph()->HeapConstant(factory()->meta_map()));
-  Node* branch0 =
-      graph()->NewNode(common()->Branch(BranchHint::kTrue), check0, control);
-
-  Node* if_true0 = graph()->NewNode(common()->IfTrue(), branch0);
-  Node* etrue0 = effect;
-  Node* vtrue0;
-  {
-    // Load the "prototype" from the initial map.
-    vtrue0 = etrue0 = graph()->NewNode(
-        simplified()->LoadField(AccessBuilder::ForMapPrototype()),
-        function_prototype_or_initial_map, etrue0, if_true0);
-  }
-
-  Node* if_false0 = graph()->NewNode(common()->IfFalse(), branch0);
-  Node* efalse0 = effect;
-  Node* vfalse0 = function_prototype_or_initial_map;
-
-  control = graph()->NewNode(common()->Merge(2), if_true0, if_false0);
-  effect = graph()->NewNode(common()->EffectPhi(2), etrue0, efalse0, control);
-  Node* value =
-      graph()->NewNode(common()->Phi(MachineRepresentation::kTaggedPointer, 2),
-                       vtrue0, vfalse0, control);
-
-  return ValueEffectControl(value, effect, control);
 }
 
 EffectControlLinearizer::ValueEffectControl