Split testdata of #KT-25432 and #KT-29767

compiler/testData/diagnostics/tests/smartCasts/inference/kt25432.kt

@@ -1,18 +1,11 @@
 // !WITH_NEW_INFERENCE
+// ISSUE: KT-25432
 
 class Data<T>(val s: T)
 
-fun test_1(d: Data<out Any>) {
+fun test(d: Data<out Any>) {
     if (d.s is String) {
         <!OI;DEBUG_INFO_SMARTCAST!>d.s<!>.<!NI;UNRESOLVED_REFERENCE!>length<!>
     }
 }
 
-fun test_2(a: MutableList<out Int?>?) {
-    if (a != null) {
-        val b = <!OI;DEBUG_INFO_SMARTCAST!>a<!>[0] // no SMARTCAST diagnostic
-        if (b != null) {
-            <!DEBUG_INFO_SMARTCAST!>b<!>.inc()
-        }
-    }
-}