[co19] skip instanceOfString_A04_t01 in d8 for ddc

Change-Id: I8333281d9a25998528c6b68e96f96c3322cc7883
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/442620
Reviewed-by: Erik Ernst <[email protected]>
Reviewed-by: Alexander Thomas <[email protected]>
Commit-Queue: Alexander Thomas <[email protected]>

Author: sgrekhov

tests/co19/co19-dartdevc.status

@@ -131,6 +131,7 @@ LibTest/html/Window/animationFrame_A01_t01: SkipByDesign # Issue #53985: request
 
 [ $compiler == ddc && $runtime == d8 ]
 LibTest/html/*: SkipByDesign # Browser tests
+LibTest/js_interop/JSAnyUtilityExtension/instanceOfString_A04_t01: Skip # https://github.com/dart-lang/sdk/issues/61204
 
 [ $compiler == ddc && $runtime == ff ]
 LibTest/html/Element/onTouchCancel_A01_t01: SkipByDesign # TouchEvent constructor not exposed in FF