Avoid getting invisible_fake visibility for properties in ExpressionCodegen

Before this change, we were computing the visibility of an inherited
private property setter, and ISE at AsmUtil.getVisibilityAccessFlag
happened ("invisible_fake is not a valid visibility in backend")

compiler/testData/codegen/box/properties/lateinit/privateSetterViaSubclass.kt

@@ -0,0 +1,16 @@
+open class A {
+    lateinit var x: String
+        private set
+
+    protected fun set(value: String) { x = value }
+}
+
+class B : A() {
+    fun init() { set("OK") }
+}
+
+fun box(): String {
+    val b = B()
+    b.init()
+    return b.x
+}