remove redundant unsafe

@@ -300,11 +300,11 @@ pub fn spin_loop() {                 all(target_feature = "v6", target_feature = "mclass"),             )         ) => {-            // SAFETY: the `cfg` attr ensures that we only execute this on arm+            // The `cfg` attr ensures that we only execute this on arm             // targets with support for the this feature. On ARMv6 in Thumb             // mode, T2 is required (see Arm DDI0406C Section A8.8.427),             // otherwise ARMv6-M or ARMv6K is enough-            unsafe { crate::arch::arm::__yield() }+            crate::arch::arm::__yield()         }         target_arch = "loongarch32" => crate::arch::loongarch32::ibar::<0>(),         target_arch = "loongarch64" => crate::arch::loongarch64::ibar::<0>(),

@@ -17,8 +17,11 @@ ))] #[inline(always)] #[unstable(feature = "stdarch_arm_hints", issue = "117218")]-pub unsafe fn __wfi() {-    hint(HINT_WFI);+pub fn __wfi() {+    // SAFETY: The right HINT_WFI constant is passed to the llvm intrinsic。+    unsafe {+        hint(HINT_WFI);+    } }  /// Generates a WFE (wait for event) hint instruction, or nothing.@@ -36,8 +39,11 @@ pub unsafe fn __wfi() { ))] #[inline(always)] #[unstable(feature = "stdarch_arm_hints", issue = "117218")]-pub unsafe fn __wfe() {-    hint(HINT_WFE);+pub fn __wfe() {+    // SAFETY: The right HINT_WFE constant is passed to the llvm intrinsic。+    unsafe {+        hint(HINT_WFE);+    } }  /// Generates a SEV (send a global event) hint instruction.@@ -54,8 +60,11 @@ pub unsafe fn __wfe() { ))] #[inline(always)] #[unstable(feature = "stdarch_arm_hints", issue = "117218")]-pub unsafe fn __sev() {-    hint(HINT_SEV);+pub fn __sev() {+    // SAFETY: The right HINT_SEV constant is passed to the llvm intrinsic。+    unsafe {+        hint(HINT_SEV);+    } }  /// Generates a send a local event hint instruction.@@ -72,8 +81,11 @@ pub unsafe fn __sev() { ))] #[inline(always)] #[unstable(feature = "stdarch_arm_hints", issue = "117218")]-pub unsafe fn __sevl() {-    hint(HINT_SEVL);+pub fn __sevl() {+    // SAFETY: The right HINT_SEVL constant is passed to the llvm intrinsic。+    unsafe {+        hint(HINT_SEVL);+    } }  /// Generates a YIELD hint instruction.@@ -94,8 +106,11 @@ pub unsafe fn __sevl() { ))] #[inline(always)] #[unstable(feature = "stdarch_arm_hints", issue = "117218")]-pub unsafe fn __yield() {-    hint(HINT_YIELD);+pub fn __yield() {+    // SAFETY: The right HINT_YIELD constant is passed to the llvm intrinsic。+    unsafe {+        hint(HINT_YIELD);+    } }  /// Generates an unspecified no-op instruction.@@ -106,8 +121,11 @@ pub unsafe fn __yield() { /// will increase execution time. #[inline(always)] #[unstable(feature = "stdarch_arm_hints", issue = "117218")]-pub unsafe fn __nop() {-    crate::arch::asm!("nop", options(nomem, nostack, preserves_flags));+pub fn __nop() {+    // SAFETY: `nop` performs no operation.+    unsafe {+        crate::arch::asm!("nop", options(nomem, nostack, preserves_flags));+    } }  unsafe extern "llvm-intrinsic" {