message: fix(language-service): disable update the `@angular/core` module
  After the user edits the file `core.d.ts`, the symbol from the core module will be invalided, which only is created when init the language service. Then the language-service will crash.
  PR Close
diff: @@ -217,7 +217,14 @@ export class TypeScriptServiceHost implements LanguageServiceHost {
  // Check if any source files have been added / changed since last computation.
  const seen = new Set<string>();
  + const ANGULAR_CORE = '@angular/core';
  + const corePath = this.reflectorHost.moduleNameToFileName(ANGULAR_CORE);
  for (const {fileName} of program.getSourceFiles()) {
  + // If the `@angular/core` has been edited, the language service should be restart,
  + // so ignore the change of `@angular/core`.
  + if (fileName === corePath) {
  + continue;
  + }
  seen.add(fileName);
  const version = this.tsLsHost.getScriptVersion(fileName);
  const lastVersion = this.fileVersions.get(fileName);
  