[interpreter] Support for ES6 class literals.

src/interpreter/interpreter.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/interpreter/interpreter.h"
 
 #include "src/ast/prettyprinter.h"
 #include "src/code-factory.h"
 #include "src/compiler.h"
 #include "src/compiler/interpreter-assembler.h"
@@ skipping 823 matching lines @@
 //
 // Calls the strict mode KeyStoreIC at FeedBackVector slot <slot> for <object>
 // and the key <key> with the value in the accumulator.
 void Interpreter::DoKeyedStoreICStrictWide(
     compiler::InterpreterAssembler* assembler) {
   Callable ic =
       CodeFactory::KeyedStoreICInOptimizedCode(isolate_, STRICT, UNINITIALIZED);
   DoKeyedStoreIC(ic, assembler);
 }
 
+// LdaInitialMap
+//
+// Loads the prototype or initial map of the JSFunction referenced by
+// the accumulator. The result is placed in the accumulator.
+void Interpreter::DoLdaInitialMap(compiler::InterpreterAssembler* assembler) {
+  Node* js_function = __ GetAccumulator();
+  Node* initial_map =
+      __ LoadObjectField(js_function, JSFunction::kPrototypeOrInitialMapOffset);
+  __ SetAccumulator(initial_map);
+  __ Dispatch();
+}
 
 // PushContext <context>
 //
 // Saves the current context in <context>, and pushes the accumulator as the
 // new current context.
 void Interpreter::DoPushContext(compiler::InterpreterAssembler* assembler) {
   Node* reg_index = __ BytecodeOperandReg(0);
   Node* new_context = __ GetAccumulator();
   Node* old_context = __ GetContext();
   __ StoreRegister(old_context, reg_index);
@@ skipping 1056 matching lines @@
   Node* index_reg = __ BytecodeOperandReg(0);
   Node* index = __ LoadRegister(index_reg);
   Node* result = __ CallRuntime(Runtime::kForInStep, index);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8