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

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

Index: src/builtins/builtins-async-iterator-gen.cc
diff --git a/src/builtins/builtins-async-iterator.cc b/src/builtins/builtins-async-iterator-gen.cc
similarity index 98%
rename from src/builtins/builtins-async-iterator.cc
rename to src/builtins/builtins-async-iterator-gen.cc
index 13d15ef2c6047e5c6f543bc2b33c21f93920549d..04510dee6ed998da5f64329cfea108b807132a77 100644
--- a/src/builtins/builtins-async-iterator.cc
+++ b/src/builtins/builtins-async-iterator-gen.cc
@@ -3,7 +3,7 @@
 // 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-factory.h"
 #include "src/code-stub-assembler.h"
@@ -12,6 +12,8 @@
 namespace v8 {
 namespace internal {
 
+using compiler::Node;
+
 namespace {
 
 // Describe fields of Context associated with the AsyncIterator unwrap closure.
@@ -22,7 +24,7 @@ class ValueUnwrapContext {
 
 class AsyncFromSyncBuiltinsAssembler : public AsyncBuiltinsAssembler {
  public:
-  explicit AsyncFromSyncBuiltinsAssembler(CodeAssemblerState* state)
+  explicit AsyncFromSyncBuiltinsAssembler(compiler::CodeAssemblerState* state)
       : AsyncBuiltinsAssembler(state) {}
 
   void ThrowIfNotAsyncFromSyncIterator(Node* const context, Node* const object,