Get the --watch flag working in tsc again.
Get the --watch flag working in tsc again.

No perf change.

fdecampredon/jsx-typescript-old-version,popravich/typescript,popravich/typescript,mbebenita/shumway.ts,mbebenita/shumway.ts,hippich/typescript,popravich/typescript,mbrowne/typescript-dci,mbrowne/typescript-dci,mbrowne/typescript-dci,hippich/typescript,fdecampredon/jsx-typescript-old-version,fdecampredon/jsx-typescript-old-version,mbebenita/shumway.ts,mbrowne/typescript-dci,hippich/typescript