JVM_IR: repair synthetic accessors to fields

compiler/testData/codegen/box/javaInterop/protectedField.kt

@@ -0,0 +1,23 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// FILE: ProtectedField.java
+
+public abstract class ProtectedField {
+    protected String field = "fail";
+}
+
+//FILE: test.kt
+package test
+
+import ProtectedField
+
+class Derived: ProtectedField() {
+    fun setAndGetField(arg: String) = myRun {
+        super.field = arg
+        super.field
+    }
+}
+
+fun myRun(f: () -> String) = f()
+
+fun box() = Derived().setAndGetField("OK")