fix: no such file or directory compiler-sfc/dist

[caoxiemeihao]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the dev branch for v2.x (or to a previous version branch), not the master branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:
packages/compiler-sfc/dist does not exist by default, resulting in an error in the build.

npm run build

[Error: ENOENT: no such file or directory, open '/Users/atom/Desktop/github-lib/vue/packages/compiler-sfc/dist/compiler-sfc.js'] {
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/Users/atom/Desktop/github-lib/vue/packages/compiler-sfc/dist/compiler-sfc.js'
}