[Interpreter] Remove register file register and replace with LoadParentFramePointer.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 378f0ce6f907f5fb4e5dee4f39f2128ce4e9f7bc..7ce73988e8631998c21b12cb005b10febccc5b1f 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -795,11 +795,9 @@ class InterpreterDispatchDescriptor : public CallInterfaceDescriptor {
                                                CallInterfaceDescriptor)
 
   static const int kAccumulatorParameter = 0;
-  static const int kRegisterFileParameter = 1;
-  static const int kBytecodeOffsetParameter = 2;
-  static const int kBytecodeArrayParameter = 3;
-  static const int kDispatchTableParameter = 4;
-  static const int kContextParameter = 5;
+  static const int kBytecodeOffsetParameter = 1;
+  static const int kBytecodeArrayParameter = 2;
+  static const int kDispatchTableParameter = 3;
 };
 
 class InterpreterPushArgsAndCallDescriptor : public CallInterfaceDescriptor {