More precise diagnostics of smart cast impossible #KT-7240 Fixed

compiler/testData/diagnostics/tests/smartCasts/varnotnull/varCapturedInClosure.kt

@@ -7,11 +7,11 @@ public fun foo() {
         } else if (s == null) {
             return -2
         } else {
-            return s<!UNSAFE_CALL!>.<!>length // Here smartcast is possible, at least in principle
+            return <!SMARTCAST_IMPOSSIBLE!>s<!>.length // Here smartcast is possible, at least in principle
         }
     }
     if (s != null) {
         System.out.println(closure())
-        System.out.println(s<!UNSAFE_CALL!>.<!>length)   // Here smartcast is not possible due to a closure predecessor
+        System.out.println(<!SMARTCAST_IMPOSSIBLE!>s<!>.length)   // Here smartcast is not possible due to a closure predecessor
     }
 }

compiler/testData/diagnostics/tests/smartCasts/varnotnull/varCapturedInInlineClosure.kt

@@ -8,7 +8,7 @@ fun IntArray.forEachIndexed( op: (i: Int, value: Int) -> Unit) {
 fun max(a: IntArray): Int? {
     var maxI: Int? = null
     a.forEachIndexed { i, value ->
-        if (maxI == null || value >= a[<!TYPE_MISMATCH!>maxI<!>])
+        if (maxI == null || value >= a[<!SMARTCAST_IMPOSSIBLE!>maxI<!>])
             maxI = i
     }
     return maxI