[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/inlineClasses/lateinitInlineClasses.fir.kt

@@ -0,0 +1,10 @@
+// !LANGUAGE: +InlineClasses
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+inline class Foo(val x: Int)
+
+lateinit var a: Foo
+
+fun foo() {
+    lateinit var b: Foo
+}