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Rollup merge of #103638 - ia0:multivalue, r=nagisa

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Add `multivalue` target feature to WASM target

This PR is similar to #99643 and #97808. It addresses #96472 for the `multivalue` target feature.

The problem I am trying to fix is to remove the following warning when compiling with `-C target-feature=+multivalue` for `--target=wasm32-unknown-unknown`.

```
warning: unknown feature specified for `-Ctarget-feature`: `multivalue`
  |
  = note: it is still passed through to the codegen backend
  = note: consider filing a feature request
```
This commit is contained in:
Manish Goregaokar 2022-11-01 20:00:39 -04:00 • committed by GitHub
commit 2cfab1f643
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compiler/rustc_codegen_ssa/src/target_features.rs
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@ -267,6 +267,7 @@ const WASM_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
// tidy-alphabetical-start // tidy-alphabetical-start
("atomics", Some(sym::wasm_target_feature)), ("atomics", Some(sym::wasm_target_feature)),
("bulk-memory", Some(sym::wasm_target_feature)), ("bulk-memory", Some(sym::wasm_target_feature)),
("multivalue", Some(sym::wasm_target_feature)),
("mutable-globals", Some(sym::wasm_target_feature)), ("mutable-globals", Some(sym::wasm_target_feature)),
("nontrapping-fptoint", Some(sym::wasm_target_feature)), ("nontrapping-fptoint", Some(sym::wasm_target_feature)),
("reference-types", Some(sym::wasm_target_feature)), ("reference-types", Some(sym::wasm_target_feature)),