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

src/interpreter/interpreter-assembler.h

Index: src/interpreter/interpreter-assembler.h
diff --git a/src/interpreter/interpreter-assembler.h b/src/interpreter/interpreter-assembler.h
index f134335b91316fdf7ca6e36a63759ed004b02b8f..03a6a97c4ed74bd895fab53eaed174d451e878e4 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -51,10 +51,8 @@ class InterpreterAssembler : public CodeStubAssembler {
   void SetContext(compiler::Node* value);
 
   // Loads from and stores to the interpreter register file.
-  compiler::Node* LoadRegister(int offset);
   compiler::Node* LoadRegister(Register reg);
   compiler::Node* LoadRegister(compiler::Node* reg_index);
-  compiler::Node* StoreRegister(compiler::Node* value, int offset);
   compiler::Node* StoreRegister(compiler::Node* value, Register reg);
   compiler::Node* StoreRegister(compiler::Node* value,
                                 compiler::Node* reg_index);
@@ -152,8 +150,6 @@ class InterpreterAssembler : public CodeStubAssembler {
   static bool TargetSupportsUnalignedAccess();
 
  private:
-  // Returns a raw pointer to start of the register file on the stack.
-  compiler::Node* RegisterFileRawPointer();
   // Returns a tagged pointer to the current function's BytecodeArray object.
   compiler::Node* BytecodeArrayTaggedPointer();
   // Returns the offset from the BytecodeArrayPointer of the current bytecode.