Smart cast impossible on when subject is no more recorded #KT-10061 Fixed

compiler/testData/diagnostics/tests/smartCasts/whenSubjectImpossibleJava.kt

@@ -0,0 +1,11 @@
+// See KT-10061
+// FILE: My.java
+public class My {
+    String getSomething() { return "xyz"; }
+}
+
+// FILE: My.kt
+fun foo(my: My) {
+    my.something!!
+    when (my.something) { }
+}