Report tracing event "trying" after all pattern match predicates.

reactor/Core/src/jetbrains/mps/logic/reactor/core/Controller.kt

@@ -158,13 +158,14 @@ class Controller(
 
     private fun processMatch(inState: ProcessingState, match: MatchRule) : ProcessingState {
         val context = Context(inState, match.logicalContext())
-        trace.trying(match)
 
         // invoke matched pattern predicates
         for (prd in match.patternPredicates()) {
             if (!tellPredicate(prd, context)) break
         }
 
+        trace.trying(match)
+
         // check guard
         for (gprd in match.rule().guard()) {
             if (!askPredicate(gprd, context)) break