Binding trace filtering: do not calculate diagnostics if no one is going to query them

compiler/tests-common/org/jetbrains/kotlin/test/KotlinTestUtils.java

@@ -196,6 +196,11 @@ public class KotlinTestUtils {
                 throw new IllegalStateException("Unresolved: " + diagnostic.getPsiElement().getText());
             }
         }
+
+        @Override
+        public boolean wantsDiagnostics() {
+            return false;
+        }
     };
 
     public static BindingTrace DUMMY_EXCEPTION_ON_ERROR_TRACE = new BindingTrace() {
@@ -276,6 +281,11 @@ public class KotlinTestUtils {
                 throw new IllegalStateException(DefaultErrorMessages.render(diagnostic));
             }
         }
+
+        @Override
+        public boolean wantsDiagnostics() {
+            return true;
+        }
     };
 
     // We suspect sequences of eight consecutive hexadecimal digits to be a package part hash code