Rollup merge of #118908 - Urgau:check-cfg-target-features, r=TaKO8Ki,GuillaumeGomez,workingjubilee

Add all known `target_feature` configs to check-cfg

This PR adds all the known `target_feature` from ~~`rustc_codegen_ssa`~~ `rustc_target` to the well known list of check-cfg.

It does so by moving the list from `rustc_codegen_ssa` to `rustc_target` ~~`rustc_session` (I not sure about this, but some of the moved function take a `Session`)~~, then using it the `fill_well_known` function.

This already proved to be useful since portable-simd had a bad cfg.

cc `@nnethercote` (since we discussed it in rust-lang/rust#118494)

Author: workingjubilee

crates/core_simd/src/swizzle_dyn.rs

@@ -55,7 +55,7 @@ where
                 16 => transize(vqtbl1q_u8, self, idxs),
                 #[cfg(all(target_feature = "avx2", not(target_feature = "avx512vbmi")))]
                 32 => transize_raw(avx2_pshufb, self, idxs),
-                #[cfg(target_feature = "avx512vl,avx512vbmi")]
+                #[cfg(all(target_feature = "avx512vl", target_feature = "avx512vbmi"))]
                 32 => transize(x86::_mm256_permutexvar_epi8, self, idxs),
                 // Notable absence: avx512bw shuffle
                 // If avx512bw is available, odds of avx512vbmi are good