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/resolve/specialConstructions/elvisAsCall.kt

@@ -21,12 +21,14 @@ fun testElvis(a: Int?, b: Int?) {
 fun testDataFlowInfo1(a: Int?, b: Int?) {
     val c: Int = a ?: b!!
     doInt(c)
-    <!DEBUG_INFO_SMARTCAST!>b<!> + 1
+    // b is nullable if a != null
+    b <!UNSAFE_INFIX_CALL!>+<!> 1
 }
 
 fun testDataFlowInfo2(a: Int?, b: Int?) {
     doInt(a ?: b!!)
-    <!DEBUG_INFO_SMARTCAST!>b<!> + 1
+    // b is nullable if a != null
+    b <!UNSAFE_INFIX_CALL!>+<!> 1
 }
 
 fun testTypeMismatch(a: String?, b: Any) {