Auto merge of rust-lang#134333 - daxpedda:stdarch-bump, r=Amanieu

Bump `stdarch`

This bumps `stdarch` to rust-lang/stdarch@684de0d to get in rust-lang/stdarch#1677 (tracked in rust-lang#133908).

From the [commit history](rust-lang/stdarch@e5e00aa...684de0d) I deduced that there shouldn't be any changes to Rust necessary.

From past PRs I'm assuming that bumping `stdarch` like this is fine, but please let me know if this is somehow inappropriate or requires something more to be done!

try-job: arm-android

Author: bors

library/portable-simd/crates/core_simd/src/vendor/arm.rs

@@ -48,17 +48,6 @@ mod neon {
     from_transmute! { unsafe u64x2 => poly64x2_t }
 }
 
-#[cfg(any(
-    all(target_feature = "v5te", not(target_feature = "mclass")),
-    all(target_feature = "mclass", target_feature = "dsp"),
-))]
-mod dsp {
-    use super::*;
-
-    from_transmute! { unsafe Simd<u16, 2> => uint16x2_t }
-    from_transmute! { unsafe Simd<i16, 2> => int16x2_t }
-}
-
 #[cfg(any(
     all(target_feature = "v6", not(target_feature = "mclass")),
     all(target_feature = "mclass", target_feature = "dsp"),
@@ -68,6 +57,8 @@ mod simd32 {
 
     from_transmute! { unsafe Simd<u8, 4> => uint8x4_t }
     from_transmute! { unsafe Simd<i8, 4> => int8x4_t }
+    from_transmute! { unsafe Simd<u16, 2> => uint16x2_t }
+    from_transmute! { unsafe Simd<i16, 2> => int16x2_t }
 }
 
 #[cfg(all(