Auto merge of #76912 - RalfJung:rollup-q9ur56h, r=RalfJung

Rollup of 14 pull requests

Successful merges:

 - #73963 (deny(unsafe_op_in_unsafe_fn) in libstd/path.rs)
 - #75099 (lint/ty: move fns to avoid abstraction violation)
 - #75502 (Use implicit (not explicit) rules for promotability by default in `const fn`)
 - #75580 (Add test for checking duplicated branch or-patterns)
 - #76310 (Add `[T; N]: TryFrom<Vec<T>>` (insta-stable))
 - #76400 (Clean up vec benches bench_in_place style)
 - #76434 (do not inline black_box when building for Miri)
 - #76492 (Add associated constant `BITS` to all integer types)
 - #76525 (Add as_str() to string::Drain.)
 - #76636 (assert ScalarMaybeUninit size)
 - #76749 (give *even better* suggestion when matching a const range)
 - #76757 (don't convert types to the same type with try_into (clippy::useless_conversion))
 - #76796 (Give a better error message when x.py uses the wrong stage for CI)
 - #76798 (Build fixes for RISC-V 32-bit Linux support)

Failed merges:

r? `@ghost`

2 files changed, 2 insertions, 1 deletions

diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
index 88c160e93b6..06718cc9803 100644
--- a/compiler/rustc_data_structures/src/lib.rs
+++ b/compiler/rustc_data_structures/src/lib.rs
@@ -14,6 +14,7 @@
 #![feature(generators)]
 #![feature(generator_trait)]
 #![feature(fn_traits)]
+#![feature(int_bits_const)]
 #![feature(min_specialization)]
 #![feature(optin_builtin_traits)]
 #![feature(nll)]
diff --git a/compiler/rustc_data_structures/src/tagged_ptr/copy.rs b/compiler/rustc_data_structures/src/tagged_ptr/copy.rs
index d39d146db31..d63bcdb3c2b 100644
--- a/compiler/rustc_data_structures/src/tagged_ptr/copy.rs
+++ b/compiler/rustc_data_structures/src/tagged_ptr/copy.rs
@@ -48,7 +48,7 @@ where
     P: Pointer,
     T: Tag,
 {
-    const TAG_BIT_SHIFT: usize = (8 * std::mem::size_of::<usize>()) - T::BITS;
+    const TAG_BIT_SHIFT: usize = usize::BITS as usize - T::BITS;
     const ASSERTION: () = {
         assert!(T::BITS <= P::BITS);
         // Used for the transmute_copy's below