WIP [esnext] implement async iteration proposal

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index e17dab0ae5f245ba5de2c18ba6ecd715097f81aa..b28ad8f4ae04ff65d9c82cd0ff29951d18b8f741 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2995,13 +2995,21 @@ void MacroAssembler::AssertBoundFunction(Register object) {
 
 void MacroAssembler::AssertGeneratorObject(Register object) {
   if (emit_debug_code()) {
+    Label ok;
     STATIC_ASSERT(kSmiTag == 0);
     tst(object, Operand(kSmiTagMask));
     Check(ne, kOperandIsASmiAndNotAGeneratorObject);
     push(object);
     CompareObjectType(object, object, object, JS_GENERATOR_OBJECT_TYPE);
     pop(object);
+    b(eq, &ok);
+
+    push(object);
+    CompareObjectType(object, object, object, JS_ASYNC_GENERATOR_OBJECT_TYPE);
+    pop(object);
     Check(eq, kOperandIsNotAGeneratorObject);
+
+    bind(&ok);
   }
 }