dart2js cps: Improve constant folding of equality operators.

tests/co19/co19-dart2js.status

Index: tests/co19/co19-dart2js.status
diff --git a/tests/co19/co19-dart2js.status b/tests/co19/co19-dart2js.status
index c59b0bf41a8e4395aee134f2b5ec976bc87d0169..72fc13a361872b4845e9119e51f8bb7ea9a9b716 100644
--- a/tests/co19/co19-dart2js.status
+++ b/tests/co19/co19-dart2js.status
@@ -9619,6 +9619,7 @@ WebPlatformTest/webstorage/storage_local_setitem_quotaexceedederr_t01: Skip # Ti
 Language/Statements/Labels/scope_t04: Crash # (switch (i){L:case 0:flag=true;break;case 2:continue L;}): continue to a labeled switch case
 Language/Statements/Continue/label_t12: Crash # (switch (2){L:case 1:flag=true;break;case 2:continue L;}): continue to a labeled switch case
 Language/Statements/Continue/label_t13: Crash # (switch (2){case 2:continue L;L:case 1:flag=true;}): continue to a labeled switch case
+Language/Types/Interface_Types/subtype_t09: Crash # Pending static: JSArray
 Language/Types/Interface_Types/subtype_t39: RuntimeError # Please triage this failure.
 LibTest/collection/ListBase/ListBase_class_A01_t02: Pass, Timeout
 LibTest/core/Invocation/isAccessor_A01_t01: Crash # Class 'PartialMethodElement' has no instance getter 'initializer'.