WIP [esnext] implement async iteration proposal

src/arm64/macro-assembler-arm64.cc

Index: src/arm64/macro-assembler-arm64.cc
diff --git a/src/arm64/macro-assembler-arm64.cc b/src/arm64/macro-assembler-arm64.cc
index b966341dfb92263ade38284861bf5569c6b30701..2d57d0d3ed29c38c158c145fcce08be76b3100de 100644
--- a/src/arm64/macro-assembler-arm64.cc
+++ b/src/arm64/macro-assembler-arm64.cc
@@ -1636,13 +1636,17 @@ void MacroAssembler::AssertBoundFunction(Register object) {
 
 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);
   }
 }