Remove uses of stdarch_x86_avx512

Author: sayantn

library/portable-simd/crates/core_simd/src/lib.rs

@@ -30,10 +30,6 @@
     any(target_arch = "powerpc", target_arch = "powerpc64"),
     feature(stdarch_powerpc)
 )]
-#![cfg_attr(
-    all(target_arch = "x86_64", target_feature = "avx512f"),
-    feature(stdarch_x86_avx512)
-)]
 #![warn(missing_docs, clippy::missing_inline_in_public_items)] // basically all items, really
 #![deny(
     unsafe_op_in_unsafe_fn,

src/tools/miri/tests/pass/shims/x86/intrinsics-x86-aes-vaes.rs

@@ -2,8 +2,6 @@
 //@only-target: x86_64 i686
 //@compile-flags: -C target-feature=+aes,+vaes,+avx512f
 
-#![feature(stdarch_x86_avx512)]
-
 use core::mem::transmute;
 #[cfg(target_arch = "x86")]
 use std::arch::x86::*;

src/tools/miri/tests/pass/shims/x86/intrinsics-x86-avx512.rs

@@ -2,8 +2,6 @@
 //@only-target: x86_64 i686
 //@compile-flags: -C target-feature=+avx512f,+avx512vl,+avx512bitalg,+avx512vpopcntdq
 
-#![feature(stdarch_x86_avx512)]
-
 #[cfg(target_arch = "x86")]
 use std::arch::x86::*;
 #[cfg(target_arch = "x86_64")]

src/tools/miri/tests/pass/shims/x86/intrinsics-x86-gfni.rs

@@ -6,7 +6,6 @@
 // be interpreted as integers; signedness does not make sense for them, but
 // __mXXXi happens to be defined in terms of signed integers.
 #![allow(overflowing_literals)]
-#![feature(stdarch_x86_avx512)]
 
 #[cfg(target_arch = "x86")]
 use std::arch::x86::*;

src/tools/miri/tests/pass/shims/x86/intrinsics-x86-vpclmulqdq.rs

@@ -8,7 +8,6 @@
 // be interpreted as integers; signedness does not make sense for them, but
 // __mXXXi happens to be defined in terms of signed integers.
 #![allow(overflowing_literals)]
-#![feature(stdarch_x86_avx512)]
 
 #[cfg(target_arch = "x86")]
 use std::arch::x86::*;

tests/ui/asm/x86_64/evex512-implicit-feature.rs

@@ -2,8 +2,6 @@
 //@ only-x86_64
 //@ compile-flags: --crate-type=lib -C target-cpu=skylake
 
-#![feature(stdarch_x86_avx512)]
-
 use std::arch::x86_64::*;
 
 #[target_feature(enable = "avx512f")]