[KLIB][tests] Reorganize "klib dump-ir" tests

- Keep the test data under "native/native.tests/testData/klib/" dir
- Rename tests from "klib ir" to "klib dump-ir"

native/native.tests/testData/klib/dump-ir/constructor.kt

@@ -0,0 +1,8 @@
+// FIR_IDENTICAL
+package test
+
+class A constructor(val x: Int) {
+    companion object {
+        fun create(x: Int): A = A(x * 2)
+    }
+}