Use opt-level=z for browser wasm

[sapphi-red]

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:

Description

I think the file size is more important than speed for browser builds. This reduces the file size by ~27% when compressed.

uncompressed: 1,652,392B -> 466,856B
compressed(gzip): 939,788B -> 338,906B

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
rollup	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 26, 2024 7:05am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.81%. Comparing base (b5560a7) to head (4031cbe).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5494   +/-   ##
=======================================
  Coverage   98.81%   98.81%           
=======================================
  Files         238      238           
  Lines        9451     9451           
  Branches     2408     2408           
=======================================
  Hits         9339     9339           
  Misses         47       47           
  Partials       65       65           

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[lukastaegert]

Thanks, that is definitely a very useful change!

[github-actions]

This PR has been released as part of rollup@4.17.0. You can test it via npm install rollup.