[refactor] Separate generated builtins and C++ builtins into separate files

src/builtins/builtins-async-function-gen.cc

 // Copyright 2017 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/builtins/builtins-async.h"
-#include "src/builtins/builtins-utils.h"
+#include "src/builtins/builtins-utils-gen.h"
 #include "src/builtins/builtins.h"
 #include "src/code-stub-assembler.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
 
-typedef compiler::Node Node;
-typedef CodeStubAssembler::ParameterMode ParameterMode;
-typedef compiler::CodeAssemblerState CodeAssemblerState;
-
 class AsyncFunctionBuiltinsAssembler : public AsyncBuiltinsAssembler {
  public:
-  explicit AsyncFunctionBuiltinsAssembler(CodeAssemblerState* state)
+  explicit AsyncFunctionBuiltinsAssembler(compiler::CodeAssemblerState* state)
       : AsyncBuiltinsAssembler(state) {}
 
  protected:
   void AsyncFunctionAwait(Node* const context, Node* const generator,
                           Node* const awaited, Node* const outer_promise,
                           const bool is_predicted_as_caught);
 
   void AsyncFunctionAwaitResumeClosure(
       Node* const context, Node* const sent_value,
       JSGeneratorObject::ResumeMode resume_mode);
@@ skipping 168 matching lines @@
   {
     // Pop the Promise under construction in an async function on
     // from catch prediction stack.
     CallRuntime(Runtime::kDebugPopPromise, context);
     Return(promise);
   }
 }
 
 }  // namespace internal
 }  // namespace v8