transpile: remove modern stdsimd split features

Author: kkysen

c2rust-transpile/src/translator/builtins.rs

@@ -395,9 +395,12 @@ impl<'c> Translation<'c> {
             "__builtin_arm_yield" => {
                 let fn_name = "__yield";
                 self.use_feature("stdsimd");
-                self.use_feature("stdarch_arm_hints");
-                // TODO needs to be behind `#![cfg_attr(target_arch = "arm", feature(stdarch_arm_neon_intrinsics))]`.
-                // self.use_feature("stdarch_arm_neon_intrinsics");
+                // TODO In Rust 1.89 (probably earlier), `#![feature(stdsimd)]`
+                // has been removed and split into (at least):
+                // `#![feature("stdarch_arm_hints")]` and
+                // `#![cfg_attr(target_arch = "arm", feature(stdarch_arm_neon_intrinsics))]`.
+                // self.use_feature("stdarch_arm_hints");
+                // self.use_feature("stdarch_arm_neon_intrinsics"); // TODO need to add `cfg_attr` support.
                 self.import_arch_function("arm", fn_name);
                 self.import_arch_function("aarch64", fn_name);
                 let ident = mk().ident_expr(fn_name);

c2rust-transpile/tests/snapshots/arch-specific/spin.aarch64.rs

@@ -8,7 +8,6 @@
     unused_mut
 )]
 #![feature(stdsimd)]
-#![feature(stdarch_arm_hints)]
 #[cfg(target_arch = "arm")]
 pub use core::arch::arm::__yield;
 #[cfg(target_arch = "aarch64")]

c2rust-transpile/tests/snapshots/[email protected]

@@ -13,7 +13,6 @@ input_file: c2rust-transpile/tests/snapshots/arch-specific/spin.c
     unused_mut
 )]
 #![feature(stdsimd)]
-#![feature(stdarch_arm_hints)]
 #[cfg(target_arch = "arm")]
 pub use core::arch::arm::__yield;
 #[cfg(target_arch = "aarch64")]