Auto merge of #132664 - matthiaskrgr:rollup-i27nr7i, r=matthiaskrgr

Rollup of 5 pull requests

Successful merges:

 - #131261 (Stabilize `UnsafeCell::from_mut`)
 - #131405 (bootstrap/codegen_ssa: ship llvm-strip and use it for -Cstrip)
 - #132077 (Add a new `wide-arithmetic` feature for WebAssembly)
 - #132562 (Remove the `wasm32-wasi` target from rustc)
 - #132660 (Remove unused errs.rs file)

Failed merges:

 - #131721 (Add new unstable feature `const_eq_ignore_ascii_case`)

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -277,6 +277,9 @@ pub(crate) fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> Option<LLVMFea
         ("x86", s) if s.starts_with("avx512") => {
             Some(LLVMFeature::with_dependency(s, TargetFeatureFoldStrength::EnableOnly("evex512")))
         }
+        // Support for `wide-arithmetic` will first land in LLVM 20 as part of
+        // llvm/llvm-project#111598
+        ("wasm32" | "wasm64", "wide-arithmetic") if get_version() < (20, 0, 0) => None,
         (_, s) => Some(LLVMFeature::new(s)),
     }
 }