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

src/compiler/js-typed-lowering.cc

 // Copyright 2014 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/js-typed-lowering.h"
 
 #include "src/ast/modules.h"
 #include "src/builtins/builtins-utils.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
@@ skipping 1381 matching lines @@
 }
 
 Node* JSTypedLowering::BuildGetModuleCell(Node* node) {
   DCHECK(node->opcode() == IrOpcode::kJSLoadModule ||
          node->opcode() == IrOpcode::kJSStoreModule);
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
 
   int32_t cell_index = OpParameter<int32_t>(node);
   Node* module = NodeProperties::GetValueInput(node, 0);
+  Type* module_type = NodeProperties::GetType(module);
+
+  if (module_type->IsHeapConstant()) {
+    Handle<Module> module_constant =
+        Handle<Module>::cast(module_type->AsHeapConstant()->Value());
+    Handle<Cell> cell_constant(module_constant->GetCell(cell_index), isolate());
+    return jsgraph()->HeapConstant(cell_constant);
+  }
 
   FieldAccess field_access;
   int index;
   if (ModuleDescriptor::GetCellIndexKind(cell_index) ==
       ModuleDescriptor::kExport) {
     field_access = AccessBuilder::ForModuleRegularExports();
     index = cell_index - 1;
   } else {
     DCHECK_EQ(ModuleDescriptor::GetCellIndexKind(cell_index),
               ModuleDescriptor::kImport);
@@ skipping 815 matching lines @@
 }
 
 
 CompilationDependencies* JSTypedLowering::dependencies() const {
   return dependencies_;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8