Martin Kustermann
f99f5b1a2b
If a function doesn't have an effect we can now mark it via
`@pragma('wasm:pure-function')`. We'll then emit this as metadata
in the `binaryen.remove.if.unused` custom section.
This allows `wasm-opt` to remove calls to such functions if the result
of the call isn't used.
For now we mark a few string functions as pure.
Closes https://github.com/dart-lang/sdk/issues/62665
Change-Id: I8d38fb5894fd98248dc4d648d99c8cdcddc271a5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/481802
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Nate Biggs <natebiggs@google.com>