WIP [esnext] implement async iteration proposal

src/arm64/macro-assembler-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1618 matching lines @@
     UseScratchRegisterScope temps(this);
     Register temp = temps.AcquireX();
 
     CompareObjectType(object, temp, temp, JS_BOUND_FUNCTION_TYPE);
     Check(eq, kOperandIsNotABoundFunction);
   }
 }
 
 void MacroAssembler::AssertGeneratorObject(Register object) {
   if (emit_debug_code()) {
+    Label ok;
     AssertNotSmi(object, kOperandIsASmiAndNotAGeneratorObject);
 
     UseScratchRegisterScope temps(this);
     Register temp = temps.AcquireX();
 
     CompareObjectType(object, temp, temp, JS_GENERATOR_OBJECT_TYPE);
+    B(eq, &ok);
+    CompareObjectType(object, temp, temp, JS_ASYNC_GENERATOR_OBJECT_TYPE);
     Check(eq, kOperandIsNotAGeneratorObject);
+    Bind(&ok);
   }
 }
 
 void MacroAssembler::AssertReceiver(Register object) {
   if (emit_debug_code()) {
     AssertNotSmi(object, kOperandIsASmiAndNotAReceiver);
 
     UseScratchRegisterScope temps(this);
     Register temp = temps.AcquireX();
 
@@ skipping 3001 matching lines @@
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64