[interpreter] move the dispatch table off heap.

src/arm64/builtins-arm64.cc

Index: src/arm64/builtins-arm64.cc
diff --git a/src/arm64/builtins-arm64.cc b/src/arm64/builtins-arm64.cc
index d84d1a6ae3fd680a31dd7f585ab29980a7a57885..3e4d20c30b1583a322eeeb537a148ca45e307a31 100644
--- a/src/arm64/builtins-arm64.cc
+++ b/src/arm64/builtins-arm64.cc
@@ -1059,10 +1059,9 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
          Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ Mov(kInterpreterBytecodeOffsetRegister,
          Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
-  __ LoadRoot(kInterpreterDispatchTableRegister,
-              Heap::kInterpreterTableRootIndex);
-  __ Add(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
-         Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ Mov(kInterpreterDispatchTableRegister,
+         Operand(ExternalReference::interpreter_dispatch_table_address(
+             masm->isolate())));
 
   // Dispatch to the first bytecode handler for the function.
   __ Ldrb(x1, MemOperand(kInterpreterBytecodeArrayRegister,
@@ -1103,10 +1102,9 @@ static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   // Initialize register file register and dispatch table register.
   __ Add(kInterpreterRegisterFileRegister, fp,
          Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
-  __ LoadRoot(kInterpreterDispatchTableRegister,
-              Heap::kInterpreterTableRootIndex);
-  __ Add(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
-         Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ Mov(kInterpreterDispatchTableRegister,
+         Operand(ExternalReference::interpreter_dispatch_table_address(
+             masm->isolate())));
 
   // Get the context from the frame.
   __ Ldr(kContextRegister,