Add resolution status to report about unsuccessful smartcast

#KT-10248 Fixed
 #KT-11119 Fixed

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/CandidateResolver.kt

@@ -559,7 +559,7 @@ class CandidateResolver(
                 }
                 if (!smartCastResult.isCorrect) {
                     // Error about unstable smart cast reported within checkAndRecordPossibleCast
-                    return OTHER_ERROR
+                    return UNSTABLE_SMARTCAST_ERROR
                 }
             }
         }

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/results/ResolutionStatus.java

@@ -24,6 +24,7 @@ public enum ResolutionStatus {
     UNKNOWN_STATUS,
     UNSAFE_CALL_ERROR,
     WRONG_NUMBER_OF_TYPE_ARGUMENTS_ERROR,
+    UNSTABLE_SMARTCAST_ERROR,
     OTHER_ERROR,
     ARGUMENTS_MAPPING_ERROR,
     // '1.foo()' shouldn't be resolved to 'fun String.foo()'
@@ -40,6 +41,7 @@ public enum ResolutionStatus {
     public static final EnumSet<ResolutionStatus>[] SEVERITY_LEVELS = new EnumSet[] {
             EnumSet.of(UNSAFE_CALL_ERROR), // weakest
             EnumSet.of(WRONG_NUMBER_OF_TYPE_ARGUMENTS_ERROR),
+            EnumSet.of(UNSTABLE_SMARTCAST_ERROR),
             EnumSet.of(OTHER_ERROR),
             EnumSet.of(ARGUMENTS_MAPPING_ERROR),
             EnumSet.of(RECEIVER_TYPE_ERROR),