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

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index 86f29983912491f5299c493f1d599156505d1180..c7d47e1737c0f9ff28e173917ada263a83e85c12 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -690,9 +690,8 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   // Load accumulator, register file, bytecode offset, dispatch table into
   // registers.
   __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
-  __ movp(kInterpreterRegisterFileRegister, rbp);
-  __ addp(kInterpreterRegisterFileRegister,
-          Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
+  __ movp(r11, rbp);
+  __ addp(r11, Immediate(InterpreterFrameConstants::kRegisterFileFromFp));
   __ movp(kInterpreterBytecodeOffsetRegister,
           Immediate(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ Move(
@@ -720,12 +719,6 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
 
 
 void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
-  // TODO(rmcilroy): List of things not currently dealt with here but done in
-  // fullcodegen's EmitReturnSequence.
-  //  - Supporting FLAG_trace for Runtime::TraceExit.
-  //  - Support profiler (specifically decrementing profiling_counter
-  //    appropriately and calling out to HandleInterrupts if necessary).
-
   // The return value is in accumulator, which is already in rax.
 
   // Leave the frame (also dropping the register file).
@@ -825,19 +818,14 @@ void Builtins::Generate_InterpreterPushArgsAndConstruct(MacroAssembler* masm) {
 
 
 static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
-  // Initialize register file register and dispatch table register.
-  __ movp(kInterpreterRegisterFileRegister, rbp);
-  __ addp(kInterpreterRegisterFileRegister,
-          Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
+  // Initialize dispatch table register.
   __ Move(
       kInterpreterDispatchTableRegister,
       ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
 
   // Get the bytecode array pointer from the frame.
-  __ movp(
-      kInterpreterBytecodeArrayRegister,
-      Operand(kInterpreterRegisterFileRegister,
-              InterpreterFrameConstants::kBytecodeArrayFromRegisterPointer));
+  __ movp(kInterpreterBytecodeArrayRegister,
+          Operand(rbp, InterpreterFrameConstants::kBytecodeArrayFromFp));
 
   if (FLAG_debug_code) {
     // Check function data field is actually a BytecodeArray object.
@@ -848,10 +836,8 @@ static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   }
 
   // Get the target bytecode offset from the frame.
-  __ movp(
-      kInterpreterBytecodeOffsetRegister,
-      Operand(kInterpreterRegisterFileRegister,
-              InterpreterFrameConstants::kBytecodeOffsetFromRegisterPointer));
+  __ movp(kInterpreterBytecodeOffsetRegister,
+          Operand(rbp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
   __ SmiToInteger32(kInterpreterBytecodeOffsetRegister,
                     kInterpreterBytecodeOffsetRegister);