First version of the new generators implementation.

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index d68339af193445d9c0a06082fae648e15b44370c..8011fbda8e89e734c51910c1da1093e0a688d6e3 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -1244,7 +1244,7 @@ void InterpretedFrame::PatchBytecodeArray(Object* bytecode_array) {
   SetExpression(index, bytecode_array);
 }
 
-Object* InterpretedFrame::GetInterpreterRegister(int register_index) const {
+Object* InterpretedFrame::ReadInterpreterRegister(int register_index) const {
   const int index = InterpreterFrameConstants::kRegisterFileExpressionIndex;
   DCHECK_EQ(
       InterpreterFrameConstants::kRegisterFilePointerFromFp,
@@ -1252,6 +1252,15 @@ Object* InterpretedFrame::GetInterpreterRegister(int register_index) const {
   return GetExpression(index + register_index);
 }
 
+void InterpretedFrame::WriteInterpreterRegister(int register_index,
+                                                Object* value) {
+  const int index = InterpreterFrameConstants::kRegisterFileExpressionIndex;
+  DCHECK_EQ(
+      InterpreterFrameConstants::kRegisterFilePointerFromFp,
+      InterpreterFrameConstants::kExpressionsOffset - index * kPointerSize);
+  return SetExpression(index + register_index, value);
+}
+
 void InterpretedFrame::Summarize(List<FrameSummary>* functions) const {
   DCHECK(functions->length() == 0);
   AbstractCode* abstract_code =