[compiler][modules] Constant-fold the loads of module cells.

src/compiler/node-properties.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/node-properties.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 419 matching lines @@
     // the {receiver} along the {effect}s.
     if (IsSame(receiver, effect)) return kNoReceiverMaps;
 
     // Continue with the next {effect}.
     DCHECK_EQ(1, effect->op()->EffectInputCount());
     effect = NodeProperties::GetEffectInput(effect);
   }
 }
 
 // static
-MaybeHandle<Context> NodeProperties::GetSpecializationContext(
-    Node* node, MaybeHandle<Context> context) {
-  switch (node->opcode()) {
-    case IrOpcode::kHeapConstant:
-      return Handle<Context>::cast(OpParameter<Handle<HeapObject>>(node));
-    case IrOpcode::kParameter: {
-      Node* const start = NodeProperties::GetValueInput(node, 0);
-      DCHECK_EQ(IrOpcode::kStart, start->opcode());
-      int const index = ParameterIndexOf(node->op());
-      // The context is always the last parameter to a JavaScript function, and
-      // {Parameter} indices start at -1, so value outputs of {Start} look like
-      // this: closure, receiver, param0, ..., paramN, context.
-      if (index == start->op()->ValueOutputCount() - 2) {
-        return context;
-      }
-      break;
-    }
-    default:
-      break;
-  }
-  return MaybeHandle<Context>();
-}
-
-
-// static
 Node* NodeProperties::GetOuterContext(Node* node, size_t* depth) {
   Node* context = NodeProperties::GetContextInput(node);
   while (*depth > 0 &&
          IrOpcode::IsContextChainExtendingOpcode(context->opcode())) {
     context = NodeProperties::GetContextInput(context);
     (*depth)--;
   }
   return context;
 }
 
@@ skipping 16 matching lines @@
 // static
 bool NodeProperties::IsInputRange(Edge edge, int first, int num) {
   if (num == 0) return false;
   int const index = edge.index();
   return first <= index && index < first + num;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8