CodeStubAssembler can generate code for builtins

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index a0cb7a0bfbc3a753d215e47d384100dc231027a7..b10ff41c9e11d4d36ec99d3fc2d6b22579858528 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -622,6 +622,8 @@ class RawMachineAssembler {
 
   // Tail call the given call descriptor and the given arguments.
   Node* TailCallN(CallDescriptor* call_descriptor, Node* function, Node** args);
+  // Tail call to a runtime function with zero arguments.
+  Node* TailCallRuntime0(Runtime::FunctionId function, Node* context);
   // Tail call to a runtime function with one argument.
   Node* TailCallRuntime1(Runtime::FunctionId function, Node* arg0,
                          Node* context);