do not force to build ref-graph when it won't be used

java/java-impl/src/com/intellij/codeInspection/inconsistentLanguageLevel/InconsistentLanguageLevelInspection.java

@@ -43,6 +43,11 @@ import org.jetbrains.annotations.NotNull;
 import java.util.Set;
 
 public class InconsistentLanguageLevelInspection extends GlobalInspectionTool {
+  @Override
+  public boolean isGraphNeeded() {
+    return false;
+  }
+
   @Override
   public void runInspection(@NotNull AnalysisScope scope,
                             @NotNull InspectionManager manager,