[cxx-interop] Fix subscript-irgen test CHECK statement (#78299)

Previously the check statement did not account for attribute groups.
This patch adds a glob at the end of the CHECK statement to allow
trailing attribute groups, and also relaxes the pattern at the
beginning.

rdar://141662805

Author: j-hui

test/Interop/Cxx/class/inheritance/subscript-irgen.swift

@@ -11,4 +11,4 @@ let _ = testGetX()
 
 // CHECK: define {{.*}}linkonce_odr{{.*}} i32 @{{(.*)(30CopyTrackedDerivedDerivedClass39__synthesizedBaseCall_operatorSubscript|__synthesizedBaseCall_operatorSubscript@CopyTrackedDerivedDerivedClass)(.*)}}(ptr {{.*}} %[[THIS_PTR:.*]], i32 {{.*}})
 // CHECK: %[[ADD_PTR:.*]] = getelementptr inbounds i8, ptr %{{.*}}, i{{32|64}} 4
-// CHECK: %[[CALL:.*]] = call {{.*}} i32 @{{.*}}CopyTrackedBaseClass{{.*}}(ptr {{.*}} %[[ADD_PTR]], i32 {{.*}})
+// CHECK: {{.*}}call {{.*}} i32 @{{.*}}CopyTrackedBaseClass{{.*}}(ptr {{.*}} %[[ADD_PTR]], i32 {{.*}}){{.*}}