test: make test agnostic to implicit conformances

It's not the point of the test.

Author: kavon

test/Concurrency/async_overload_filtering.swift

@@ -18,11 +18,12 @@ func filter_async(_: String) -> Void {}
 var a: String? = nil
 
 // CHECK: attempting disjunction choice $T0 bound to decl async_overload_filtering.(file).filter_async(fn2:)
-// CHECK-NEXT: added constraint: {{.*}} conforms to Copyable
-// CHECK-NEXT: overload set choice binding $T0 := {{.*}}
+// CHECK-NOT: simplification result
+// CHECK: overload set choice binding $T0 := {{.*}}
 // CHECK-NEXT: (considering: ({{.*}}) -> {{.*}} applicable fn {{.*}}
 // CHECK: increasing 'sync-in-asynchronous' score by 1
 // CHECK: solution is worse than the best solution
+
 filter_async {
   Obj()
 }.op("" + (a ?? "a"))