Analysis API: add test covering get missing when branches

Also fix FIR implementation to generate boolean branches in the same
order as FE1.0.

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirWhenExhaustivenessTransformer.kt

@@ -245,12 +245,12 @@ private object WhenOnBooleanExhaustivenessChecker : WhenExhaustivenessChecker()
     ) {
         val flags = Flags()
         whenExpression.accept(ConditionChecker, flags)
-        if (!flags.containsFalse) {
-            destination.add(WhenMissingCase.BooleanIsMissing.False)
-        }
         if (!flags.containsTrue) {
             destination.add(WhenMissingCase.BooleanIsMissing.True)
         }
+        if (!flags.containsFalse) {
+            destination.add(WhenMissingCase.BooleanIsMissing.False)
+        }
     }
 
     private object ConditionChecker : AbstractConditionChecker<Flags>() {