Add different tests on class loaders in reflection

compiler/testData/codegen/reflection/classLoaders/differentClassLoaders.kt

@@ -0,0 +1,23 @@
+package test
+
+import kotlin.reflect.KClass
+import kotlin.test.*
+
+class K(val p: String)
+
+class Test {
+    fun kClass(): Any = K::class
+
+    fun doTest(k1: KClass<*>, k2: KClass<*>) {
+        // KClass instances for classes loaded with different class loaders should have the same string representation,
+        // but should not be equal
+        assertEquals("$k1", "$k2")
+        assertNotEquals(k1, k2)
+
+        // The same for properties of these classes
+        val p1 = k1.properties.first()
+        val p2 = k2.properties.first()
+        assertEquals("$p1", "$p2")
+        assertNotEquals(p1, p2)
+    }
+}

compiler/testData/codegen/reflection/classLoaders/parentFirst.kt

@@ -0,0 +1,15 @@
+package test
+
+import kotlin.reflect.KClass
+import kotlin.test.*
+
+class K
+
+class Test {
+    fun kClass(): Any = K::class
+
+    fun doTest(k1: KClass<*>, k2: KClass<*>) {
+        // KClass instances should be equal for classes loaded with the child and the parent
+        assertEquals(k1, k2)
+    }
+}