[Interpreter] Maintain a pointer to the current position in the bytecode

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 183d4ddaefff1e11306170eea5be41dee460e64a..97b636e5e86f7f8fa2ad74c16116341823268b70 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -171,6 +171,7 @@ class InterpreterAssembler : public CodeStubAssembler {
   // Returns the frame pointer for the interpreted frame of the function being
   // interpreted.
   compiler::Node* GetInterpretedFramePointer();
+  compiler::Node* BytecodeInnerPointer();
 
   // Saves and restores interpreter bytecode offset to the interpreter stack
   // frame when performing a call.
@@ -239,6 +240,7 @@ class InterpreterAssembler : public CodeStubAssembler {
   Bytecode bytecode_;
   OperandScale operand_scale_;
   CodeStubAssembler::Variable interpreted_frame_pointer_;
+  CodeStubAssembler::Variable bytecode_inner_pointer_;
   CodeStubAssembler::Variable accumulator_;
   AccumulatorUse accumulator_use_;
   bool made_call_;