move test to patmat

[Cherry-picked 0696aec]

Author: Alex1005a

tests/patmat/patmat-lazy-nothing-not-exhaustive.check

@@ -0,0 +1 @@
+8: Pattern Match Exhaustivity: Bar()

tests/warn/patmat-lazy-nothing-not-exhaustive.scala renamed to tests/patmat/patmat-lazy-nothing-not-exhaustive.scala

@@ -4,9 +4,7 @@ case class Bar() extends Adt {
   lazy val x: Nothing = throw new Exception()
 }
 
-inline def id[A](a: A): A = a
-
 def shouldThrowAWarning(x: Adt) =
-  id(x match { // warn
-    case Foo() => "Bar"
-  })
+  x match { // warn
+    case Foo() => "Foo"
+  }