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

^KT-53663

compiler/testData/klibABI/nonAbstractPropertyInAbstractClassBecomesAbstract/lib2/l2.kt

@@ -0,0 +1,38 @@
+package lib2
+
+import lib1.A
+
+class B : A() {
+    override val baz1 = -42
+    override val baz2 get() = -42
+
+    val unlinkedPropertyUsage get() = foo1 + foo2 + bar1 + bar2
+}
+
+class B1 : A() {
+    override val baz1 = -42
+    override val baz2 get() = -42
+
+    val unlinkedPropertyUsage = foo1
+}
+
+class B2 : A() {
+    override val baz1 = -42
+    override val baz2 get() = -42
+
+    val unlinkedPropertyUsage = foo2
+}
+
+class B3 : A() {
+    override val baz1 = -42
+    override val baz2 get() = -42
+
+    val unlinkedPropertyUsage = bar1
+}
+
+class B4 : A() {
+    override val baz1 = -42
+    override val baz2 get() = -42
+
+    val unlinkedPropertyUsage = bar2
+}