JVM_IR: fix synthetic accessor generation (again)

Turns out private inline functions *can* be called from other classes.

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

@@ -0,0 +1,7 @@
+class A {
+    private inline fun f() = g()
+    private fun g() = "OK"
+    fun h() = { f() }
+}
+
+fun box() = A().h()()