Fix uses of IfAbruptRejectPromise

This was not done correctly in f8f5650.

Author: bakkot

index.bs

@@ -12568,7 +12568,7 @@ The \[[Prototype]] [=internal slot=] of an [=asynchronous iterator prototype obj
     1.  Let |thisValidationPromiseCapability| be [=!=] [$NewPromiseCapability$]({{%Promise%}}).
 
     1.  Let |thisValue| be the <emu-val>this</emu-val> value.
-    1.  Let |object| be [=?=] <a abstract-op>ToObject</a>(|thisValue|).
+    1.  Let |object| be <a abstract-op>Completion</a>(<a abstract-op>ToObject</a>(|thisValue|)).
 
     1.  [$IfAbruptRejectPromise$](|object|, |thisValidationPromiseCapability|).
 
@@ -12658,7 +12658,7 @@ The \[[Prototype]] [=internal slot=] of an [=asynchronous iterator prototype obj
     1.  Let |returnPromiseCapability| be [=!=] [$NewPromiseCapability$]({{%Promise%}}).
 
     1.  Let |thisValue| be the <emu-val>this</emu-val> value.
-    1.  Let |object| be [=?=] <a abstract-op>ToObject</a>(|thisValue|).
+    1.  Let |object| be <a abstract-op>Completion</a>(<a abstract-op>ToObject</a>(|thisValue|)).
 
     1.  [$IfAbruptRejectPromise$](|object|, |returnPromiseCapability|).