Make assertion scopes thread safe.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index dc30a6ca626df5633da45ae97281d8df446b288f..46e2c694e835cd23fe07730bdb3ebde56892205b 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2295,7 +2295,7 @@ void MacroAssembler::Move(Register dst, Register src) {
 
 
 void MacroAssembler::Move(Register dst, Handle<Object> source) {
-  ALLOW_HANDLE_DEREF(isolate(), "smi check");
+  AllowDeferredHandleDereference smi_check;
   if (source->IsSmi()) {
     Move(dst, Smi::cast(*source));
   } else {
@@ -2306,7 +2306,7 @@ void MacroAssembler::Move(Register dst, Handle<Object> source) {
 
 
 void MacroAssembler::Move(const Operand& dst, Handle<Object> source) {
-  ALLOW_HANDLE_DEREF(isolate(), "smi check");
+  AllowDeferredHandleDereference smi_check;
   if (source->IsSmi()) {
     Move(dst, Smi::cast(*source));
   } else {
@@ -2318,7 +2318,7 @@ void MacroAssembler::Move(const Operand& dst, Handle<Object> source) {
 
 
 void MacroAssembler::Cmp(Register dst, Handle<Object> source) {
-  ALLOW_HANDLE_DEREF(isolate(), "smi check");
+  AllowDeferredHandleDereference smi_check;
   if (source->IsSmi()) {
     Cmp(dst, Smi::cast(*source));
   } else {
@@ -2330,7 +2330,7 @@ void MacroAssembler::Cmp(Register dst, Handle<Object> source) {
 
 
 void MacroAssembler::Cmp(const Operand& dst, Handle<Object> source) {
-  ALLOW_HANDLE_DEREF(isolate(), "smi check");
+  AllowDeferredHandleDereference smi_check;
   if (source->IsSmi()) {
     Cmp(dst, Smi::cast(*source));
   } else {
@@ -2342,7 +2342,7 @@ void MacroAssembler::Cmp(const Operand& dst, Handle<Object> source) {
 
 
 void MacroAssembler::Push(Handle<Object> source) {
-  ALLOW_HANDLE_DEREF(isolate(), "smi check");
+  AllowDeferredHandleDereference smi_check;
   if (source->IsSmi()) {
     Push(Smi::cast(*source));
   } else {
@@ -2355,7 +2355,7 @@ void MacroAssembler::Push(Handle<Object> source) {
 
 void MacroAssembler::LoadHeapObject(Register result,
                                     Handle<HeapObject> object) {
-  ALLOW_HANDLE_DEREF(isolate(), "using raw address");
+  AllowDeferredHandleDereference using_raw_address;
   if (isolate()->heap()->InNewSpace(*object)) {
     Handle<JSGlobalPropertyCell> cell =
         isolate()->factory()->NewJSGlobalPropertyCell(object);
@@ -2368,7 +2368,7 @@ void MacroAssembler::LoadHeapObject(Register result,
 
 
 void MacroAssembler::CmpHeapObject(Register reg, Handle<HeapObject> object) {
-  ALLOW_HANDLE_DEREF(isolate(), "using raw address");
+  AllowDeferredHandleDereference using_raw_address;
   if (isolate()->heap()->InNewSpace(*object)) {
     Handle<JSGlobalPropertyCell> cell =
         isolate()->factory()->NewJSGlobalPropertyCell(object);
@@ -2381,7 +2381,7 @@ void MacroAssembler::CmpHeapObject(Register reg, Handle<HeapObject> object) {
 
 
 void MacroAssembler::PushHeapObject(Handle<HeapObject> object) {
-  ALLOW_HANDLE_DEREF(isolate(), "using raw address");
+  AllowDeferredHandleDereference using_raw_address;
   if (isolate()->heap()->InNewSpace(*object)) {
     Handle<JSGlobalPropertyCell> cell =
         isolate()->factory()->NewJSGlobalPropertyCell(object);
@@ -2397,7 +2397,7 @@ void MacroAssembler::PushHeapObject(Handle<HeapObject> object) {
 void MacroAssembler::LoadGlobalCell(Register dst,
                                     Handle<JSGlobalPropertyCell> cell) {
   if (dst.is(rax)) {
-    ALLOW_HANDLE_DEREF(isolate(), "embedding raw address");
+    AllowDeferredHandleDereference embedding_raw_address;
     load_rax(cell.location(), RelocInfo::GLOBAL_PROPERTY_CELL);
   } else {
     movq(dst, cell, RelocInfo::GLOBAL_PROPERTY_CELL);