UNNECESSARY_LATEINIT warning introduced #KT-13295 Fixed

(cherry picked from commit 88f9938)

compiler/testData/diagnostics/tests/controlFlowAnalysis/unnecessaryLateinit/lateinitWithInit.kt

@@ -0,0 +1,7 @@
+class Foo {
+    <!UNNECESSARY_LATEINIT!>lateinit<!> var bar: String
+
+    init {
+        bar = ""
+    }
+}