JVM_IR: generate accessors for inherited abstract members too

#KT-41468 Fixed

compiler/testData/codegen/box/syntheticAccessors/accessorForAbstractProtected.kt

@@ -0,0 +1,17 @@
+// FILE: 1.kt
+import a.*
+
+abstract class B : A() {
+    fun g() = { f() }()
+}
+
+fun box() = object : B() {
+    override fun f(): String = "OK"
+}.g()
+
+// FILE: 2.kt
+package a
+
+abstract class A {
+    protected abstract fun f(): String
+}