Use updateGraphIfDirty to do quick check if project update is needed

With this updateGraph is used only in locations we are certain project is dirty

src/server/session.ts

@@ -695,7 +695,7 @@ namespace ts.server {
                 const { fileName, project } = checkList[index];
                 index++;
                 // Ensure the project is upto date before checking if this file is present in the project
-                project.updateGraph();
+                updateProjectIfDirty(project);
                 if (!project.containsFile(fileName, requireOpen)) {
                     return;
                 }
@@ -1084,7 +1084,7 @@ namespace ts.server {
 
         private getProjectInfoWorker(uncheckedFileName: string, projectFileName: string | undefined, needFileNameList: boolean, excludeConfigFiles: boolean) {
             const { project } = this.getFileAndProjectWorker(uncheckedFileName, projectFileName);
-            project.updateGraph();
+            updateProjectIfDirty(project);
             const projectInfo = {
                 configFileName: project.getProjectName(),
                 languageServiceDisabled: !project.languageServiceEnabled,