[interpreter] move the dispatch table off heap.

src/x87/builtins-x87.cc

Index: src/x87/builtins-x87.cc
diff --git a/src/x87/builtins-x87.cc b/src/x87/builtins-x87.cc
index 4597a502c2e1bcc2415541769917d08a828771a2..a7352ab5bd1fe8136543bd6f6b64ef3afdfa3653 100644
--- a/src/x87/builtins-x87.cc
+++ b/src/x87/builtins-x87.cc
@@ -609,10 +609,8 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
          Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ mov(kInterpreterBytecodeOffsetRegister,
          Immediate(BytecodeArray::kHeaderSize - kHeapObjectTag));
-  // Since the dispatch table root might be set after builtins are generated,
-  // load directly from the roots table.
-  __ LoadRoot(ebx, Heap::kInterpreterTableRootIndex);
-  __ add(ebx, Immediate(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ mov(ebx, Immediate(ExternalReference::interpreter_dispatch_table_address(
+                  masm->isolate())));
 
   // Push dispatch table as a stack located parameter to the bytecode handler.
   DCHECK_EQ(-1, kInterpreterDispatchTableSpillSlot);
@@ -774,8 +772,8 @@ static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   __ SmiUntag(kInterpreterBytecodeOffsetRegister);
 
   // Push dispatch table as a stack located parameter to the bytecode handler.
-  __ LoadRoot(ebx, Heap::kInterpreterTableRootIndex);
-  __ add(ebx, Immediate(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ mov(ebx, Immediate(ExternalReference::interpreter_dispatch_table_address(
+                  masm->isolate())));
   DCHECK_EQ(-1, kInterpreterDispatchTableSpillSlot);
   __ Pop(esi);
   __ Push(ebx);