Bump stage0 to 1.96 beta

compiler/rustc_data_structures/src/aligned.rs

@@ -1,8 +1,5 @@
 use std::marker::PointeeSized;
-#[cfg(not(bootstrap))]
 use std::mem::Alignment;
-#[cfg(bootstrap)]
-use std::ptr::Alignment;
 
 /// Returns the ABI-required minimum alignment of a type in bytes.
 ///

compiler/rustc_data_structures/src/tagged_ptr.rs

@@ -56,9 +56,6 @@ pub unsafe trait Tag: Copy {
 /// (this is based on `T`'s alignment).
 pub const fn bits_for<T: ?Sized + Aligned>() -> u32 {
     let alignment = crate::aligned::align_of::<T>();
-    #[cfg(bootstrap)]
-    let alignment = alignment.as_nonzero();
-    #[cfg(not(bootstrap))]
     let alignment = alignment.as_nonzero_usize();
     alignment.trailing_zeros()
 }