Rollup merge of rust-lang#104704 - ecnelises:p10vec, r=jackh726

Allow power10-vector feature in PowerPC

Note that we don't have `power10-altivec`:

https://github.com/llvm/llvm-project/blob/57fd7ffefffae313de800fecdd9f095a17bfd4ea/llvm/lib/Target/PowerPC/PPC.td#L277-L280

Author: matthiaskrgr

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -215,6 +215,7 @@ const HEXAGON_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
 const POWERPC_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     // tidy-alphabetical-start
     ("altivec", Some(sym::powerpc_target_feature)),
+    ("power10-vector", Some(sym::powerpc_target_feature)),
     ("power8-altivec", Some(sym::powerpc_target_feature)),
     ("power8-vector", Some(sym::powerpc_target_feature)),
     ("power9-altivec", Some(sym::powerpc_target_feature)),