fix instrumented function metric

Author: ZNeumann

agent/php_observer.c

@@ -115,12 +115,15 @@ static zend_observer_fcall_handlers nr_php_fcall_register_handlers(
       }
   }
   handlers.begin = wraprec->special_instrumentation_before ?
-                   (zend_observer_fcall_begin_handler)wraprec->special_instrumentation_before :
-                   nr_php_observer_fcall_begin_instrumented;
+                     (zend_observer_fcall_begin_handler)wraprec->special_instrumentation_before :
+                     wraprec->is_transient ? 
+                       nr_php_observer_fcall_begin :
+                       nr_php_observer_fcall_begin_instrumented;
   handlers.end = wraprec->special_instrumentation ?
-                 (zend_observer_fcall_end_handler)wraprec->special_instrumentation :
-                 wraprec->create_metric ? nr_php_observer_fcall_end_create_metric:
-                 nr_php_observer_fcall_end;
+                   (zend_observer_fcall_end_handler)wraprec->special_instrumentation :
+                   wraprec->create_metric ?
+                     nr_php_observer_fcall_end_create_metric :
+                     nr_php_observer_fcall_end;
   return handlers;
 }
 #endif