[interpreter] Support for ES6 class literals.

src/compiler/bytecode-graph-builder.cc

Index: src/compiler/bytecode-graph-builder.cc
diff --git a/src/compiler/bytecode-graph-builder.cc b/src/compiler/bytecode-graph-builder.cc
index f337a57c66209d75696e37dacc1796db8c4abaa2..0948b4ed6cc28deaafa1ff1d426c0c34fdfd90bb 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -964,6 +964,13 @@ void BytecodeGraphBuilder::VisitKeyedStoreICStrictWide() {
   BuildKeyedStore();
 }
 
+void BytecodeGraphBuilder::VisitLdaInitialMap() {
+  Node* js_function = environment()->LookupAccumulator();
+  Node* load = BuildLoadObjectField(js_function,
+                                    JSFunction::kPrototypeOrInitialMapOffset);
+  environment()->BindAccumulator(load);
+}
+
 void BytecodeGraphBuilder::VisitPushContext() {
   Node* new_context = environment()->LookupAccumulator();
   environment()->BindRegister(bytecode_iterator().GetRegisterOperand(0),