added info about smart casts to diagnostic tests

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/ArrayGetSetConvention.kt

@@ -4,23 +4,23 @@ trait G {
 }
 
 fun foo1(a: Int?, b: G) {
-    b[a!!, a<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>] = a
-    a : Int
+    b[a!!, a<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>] = <!DEBUG_INFO_AUTOCAST!>a<!>
+    <!DEBUG_INFO_AUTOCAST!>a<!> : Int
 }
 
 fun foo2(a: Int?, b: G) {
-    b[0, a!!] = a
-    a : Int
+    b[0, a!!] = <!DEBUG_INFO_AUTOCAST!>a<!>
+    <!DEBUG_INFO_AUTOCAST!>a<!> : Int
 }
 
 fun foo3(a: Int?, b: G) {
-    val r = b[a!!, a]
-    a : Int
+    val r = b[a!!, <!DEBUG_INFO_AUTOCAST!>a<!>]
+    <!DEBUG_INFO_AUTOCAST!>a<!> : Int
     r : Int
 }
 
 fun foo4(a: Int?, b: G) {
     val r = b[0, a!!]
-    a : Int
+    <!DEBUG_INFO_AUTOCAST!>a<!> : Int
     r : Int
 }