Handle shimming missing exports when preserving modules

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

• resolves shimMissingExports will cause error when treeshake and preserveModules both is true #4884

Description

This ensures that modules with shimmed missing exports always get a chunk created when preserving modules

[vercel]

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Name	Status	Preview	Updated (UTC)
rollup	✅ Ready (Inspect)	Visit Preview	May 3, 2023 6:18am

[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#missing-export-preserve-modules

or load it into the REPL:
https://rollup-flz5jri1z-rollup-js.vercel.app/repl/?pr=4971

[codecov]

Codecov Report

Merging #4971 (3bcdf0c) into master (5628d16) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4971   +/-   ##
=======================================
  Coverage   98.99%   98.99%           
=======================================
  Files         222      222           
  Lines        8123     8123           
  Branches     2237     2237           
=======================================
  Hits         8041     8041           
  Misses         28       28           
  Partials       54       54           

Impacted Files	Coverage Δ
src/Module.ts	100.00% <100.00%> (ø)

[rollup-bot]

This PR has been released as part of rollup@3.21.4. You can test it via npm install rollup.