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/elvisExclExclPlatform.kt

@@ -0,0 +1,27 @@
+// FILE: p/My.java
+
+package p;
+
+import org.jetbrains.annotations.*;
+
+class My {
+    @Nullable static String create() {
+        return "";
+    }
+}
+
+// FILE: test.kt
+
+package p
+
+fun bar(x: String) = x
+
+fun test(x: String?): Any {
+    val y = My.create()
+    val z = x ?: y!!
+    bar(<!TYPE_MISMATCH!>y<!>)
+    // !! / ?. is necessary here, because y!! above may not be executed
+    y?.hashCode()
+    y!!.hashCode()
+    return z
+}