[IR][tests] New test: change of visibility for callables

compiler/testData/klibABI/changeFunctionVisibility/lib1/l1.kt

@@ -0,0 +1,12 @@
+public fun publicToInternalFunction() = 42
+public fun publicToPrivateFunction() = 42
+
+open class Container {
+    public fun publicToProtectedFunction() = 42
+    public fun publicToInternalFunction() = 42
+    public fun publicToPrivateFunction() = 42
+
+    protected fun protectedToPublicFunction() = 42
+    protected fun protectedToInternalFunction() = 42
+    protected fun protectedToPrivateFunction() = 42
+}

compiler/testData/klibABI/changeFunctionVisibility/lib1/l1.kt.1

@@ -0,0 +1,12 @@
+internal fun publicToInternalFunction() = 42
+private fun publicToPrivateFunction() = 42
+
+open class Container {
+    protected fun publicToProtectedFunction() = 42
+    internal fun publicToInternalFunction() = 42
+    private fun publicToPrivateFunction() = 42
+
+    public fun protectedToPublicFunction() = 42
+    internal fun protectedToInternalFunction() = 42
+    private fun protectedToPrivateFunction() = 42
+}

compiler/testData/klibABI/changeFunctionVisibility/lib1/module.info

@@ -0,0 +1,6 @@
+STEP 0:
+    dependencies: stdlib
+STEP 1:
+    dependencies: stdlib
+    modifications:
+        U : l1.kt.1 -> l1.kt