[IR][tests] New test: non-abstract callable member in abstract class becomes abstract

^KT-53663

compiler/testData/klibABI/nonAbstractPropertyInAbstractClassBecomesAbstract/lib1/l1.kt.0

@@ -0,0 +1,10 @@
+package lib1
+
+abstract class A {
+    val foo1: Int = 42
+    val foo2: Int get() = 42
+    open val bar1: Int = 42
+    open val bar2: Int get() = 42
+    open val baz1: Int = 42
+    open val baz2: Int get() = 42
+}