[Bounds-Safety] Fix pragma-attribute-supported-attributes-list.test

0ec3b97 changed the `counted_by`
attribute to be `LateAttrParseExperimentalExt`. This means the attribute
is no longer supported by `#pragma clang attribute`. However, the
`pragma-attribute-supported-attributes-list.test` wasn't updated
to account for that.

rdar://125400257

Author: delcypher

clang/test/Misc/pragma-attribute-supported-attributes-list.test

@@ -63,7 +63,6 @@
 // CHECK-NEXT: CoroOnlyDestroyWhenComplete (SubjectMatchRule_record)
 // CHECK-NEXT: CoroReturnType (SubjectMatchRule_record)
 // CHECK-NEXT: CoroWrapper (SubjectMatchRule_function)
-// CHECK-NEXT: CountedBy (SubjectMatchRule_field)
 // CHECK-NEXT: DLLExport (SubjectMatchRule_function, SubjectMatchRule_variable, SubjectMatchRule_record, SubjectMatchRule_objc_interface)
 // CHECK-NEXT: DLLImport (SubjectMatchRule_function, SubjectMatchRule_variable, SubjectMatchRule_record, SubjectMatchRule_objc_interface)
 // CHECK-NEXT: Destructor (SubjectMatchRule_function)