[Atomics] code stubs for atomic operations

src/compiler/raw-machine-assembler.cc

Index: src/compiler/raw-machine-assembler.cc
diff --git a/src/compiler/raw-machine-assembler.cc b/src/compiler/raw-machine-assembler.cc
index 0d4b8cb20079b0e28fd45fa435c6b48611e99709..aaba0456a91459d3b63a70d642aa7d2ef3d6a796 100644
--- a/src/compiler/raw-machine-assembler.cc
+++ b/src/compiler/raw-machine-assembler.cc
@@ -248,6 +248,29 @@ Node* RawMachineAssembler::TailCallN(CallDescriptor* desc, Node* function,
 }
 
 
+Node* RawMachineAssembler::TailCallRuntime0(Runtime::FunctionId function,
+                                            Node* context) {
+  const int kArity = 0;
+  CallDescriptor* desc = Linkage::GetRuntimeCallDescriptor(
+      zone(), function, kArity, Operator::kNoProperties,
+      CallDescriptor::kSupportsTailCalls);
+  int return_count = static_cast<int>(desc->ReturnCount());
+
+  Node* centry = HeapConstant(CEntryStub(isolate(), return_count).GetCode());
+  Node* ref = AddNode(
+      common()->ExternalConstant(ExternalReference(function, isolate())));
+  Node* arity = Int32Constant(kArity);
+
+  Node* nodes[] = {centry, ref, arity, context};
+  Node* tail_call = MakeNode(common()->TailCall(desc), arraysize(nodes), nodes);
+
+  NodeProperties::MergeControlToEnd(graph(), common(), tail_call);
+  schedule()->AddTailCall(CurrentBlock(), tail_call);
+  current_block_ = nullptr;
+  return tail_call;
+}
+
+
 Node* RawMachineAssembler::TailCallRuntime1(Runtime::FunctionId function,
                                             Node* arg1, Node* context) {
   const int kArity = 1;