Elvis DFA: now only left part is taken into account #KT-9100 Fixed

I had to fix a few incorrect tests using something like x!! in Elvis right part, and also one bug in our code

compiler/testData/diagnostics/tests/smartCasts/loops/elvisLeftBreakInsideWhileTrue.kt

@@ -1,8 +1,8 @@
 public fun foo(x: String?, y: String?): Int {
     while (true) {
         (if (x != null) break else y) ?: y!!
-        // x is not null in both branches
-        <!DEBUG_INFO_SMARTCAST!>y<!>.length()
+        // y is not null in both branches but it's hard to determine
+        y<!UNSAFE_CALL!>.<!>length()
     }
     // y can be null because of the break
     return y<!UNSAFE_CALL!>.<!>length()