[Interpreter] Remove all Ldr style bytecodes and replace with Star lookahead.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 9b6662eeba69b99a80accd162fe29957611e5f86..81aecafecfdfbba9b465c7f54b6f1b685f6bf5e7 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -352,17 +352,6 @@ void Interpreter::DoLdaUndefined(InterpreterAssembler* assembler) {
   __ Dispatch();
 }
 
-// LdrUndefined <reg>
-//
-// Loads undefined into the accumulator and |reg|.
-void Interpreter::DoLdrUndefined(InterpreterAssembler* assembler) {
-  Node* undefined_value =
-      __ HeapConstant(isolate_->factory()->undefined_value());
-  Node* destination = __ BytecodeOperandReg(0);
-  __ StoreRegister(undefined_value, destination);
-  __ Dispatch();
-}
-
 // LdaNull
 //
 // Load Null into the accumulator.
@@ -460,23 +449,6 @@ void Interpreter::DoLdaGlobal(InterpreterAssembler* assembler) {
   __ Dispatch();
 }
 
-// LdrGlobal <slot> <reg>
-//
-// Load the global with name in constant pool entry <name_index> into
-// register <reg> using FeedBackVector slot <slot> outside of a typeof.
-void Interpreter::DoLdrGlobal(InterpreterAssembler* assembler) {
-  Callable ic =
-      CodeFactory::LoadGlobalICInOptimizedCode(isolate_, NOT_INSIDE_TYPEOF);
-
-  Node* context = __ GetContext();
-
-  Node* raw_slot = __ BytecodeOperandIdx(0);
-  Node* result = BuildLoadGlobal(ic, context, raw_slot, assembler);
-  Node* destination = __ BytecodeOperandReg(1);
-  __ StoreRegister(result, destination);
-  __ Dispatch();
-}
-
 // LdaGlobalInsideTypeof <slot>
 //
 // Load the global with name in constant pool entry <name_index> into the
@@ -534,29 +506,17 @@ void Interpreter::DoStaGlobalStrict(InterpreterAssembler* assembler) {
   DoStaGlobal(ic, assembler);
 }
 
-compiler::Node* Interpreter::BuildLoadContextSlot(
-    InterpreterAssembler* assembler) {
-  Node* reg_index = __ BytecodeOperandReg(0);
-  Node* context = __ LoadRegister(reg_index);
-  Node* slot_index = __ BytecodeOperandIdx(1);
-  Node* depth = __ BytecodeOperandUImm(2);
-  Node* slot_context = __ GetContextAtDepth(context, depth);
-  return __ LoadContextElement(slot_context, slot_index);
-}
-
-compiler::Node* Interpreter::BuildLoadCurrentContextSlot(
-    InterpreterAssembler* assembler) {
-  Node* slot_index = __ BytecodeOperandIdx(0);
-  Node* slot_context = __ GetContext();
-  return __ LoadContextElement(slot_context, slot_index);
-}
-
 // LdaContextSlot <context> <slot_index> <depth>
 //
 // Load the object in |slot_index| of the context at |depth| in the context
 // chain starting at |context| into the accumulator.
 void Interpreter::DoLdaContextSlot(InterpreterAssembler* assembler) {
-  Node* result = BuildLoadContextSlot(assembler);
+  Node* reg_index = __ BytecodeOperandReg(0);
+  Node* context = __ LoadRegister(reg_index);
+  Node* slot_index = __ BytecodeOperandIdx(1);
+  Node* depth = __ BytecodeOperandUImm(2);
+  Node* slot_context = __ GetContextAtDepth(context, depth);
+  Node* result = __ LoadContextElement(slot_context, slot_index);
   __ SetAccumulator(result);
   __ Dispatch();
 }
@@ -565,32 +525,13 @@ void Interpreter::DoLdaContextSlot(InterpreterAssembler* assembler) {
 //
 // Load the object in |slot_index| of the current context into the accumulator.
 void Interpreter::DoLdaCurrentContextSlot(InterpreterAssembler* assembler) {
-  Node* result = BuildLoadCurrentContextSlot(assembler);
+  Node* slot_index = __ BytecodeOperandIdx(0);
+  Node* slot_context = __ GetContext();
+  Node* result = __ LoadContextElement(slot_context, slot_index);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
-// LdrContextSlot <context> <slot_index> <depth> <reg>
-//
-// Load the object in |slot_index| of the context at |depth| in the context
-// chain of |context| into register |reg|.
-void Interpreter::DoLdrContextSlot(InterpreterAssembler* assembler) {
-  Node* result = BuildLoadContextSlot(assembler);
-  Node* destination = __ BytecodeOperandReg(3);
-  __ StoreRegister(result, destination);
-  __ Dispatch();
-}
-
-// LdrCurrentContextSlot <slot_index> <reg>
-//
-// Load the object in |slot_index| of the current context into register |reg|.
-void Interpreter::DoLdrCurrentContextSlot(InterpreterAssembler* assembler) {
-  Node* result = BuildLoadCurrentContextSlot(assembler);
-  Node* destination = __ BytecodeOperandReg(1);
-  __ StoreRegister(result, destination);
-  __ Dispatch();
-}
-
 // StaContextSlot <context> <slot_index> <depth>
 //
 // Stores the object in the accumulator into |slot_index| of the context at