Auto merge of #61418 - Centril:rollup-yvj33a1, r=Centril

Rollup of 8 pull requests

Successful merges:

 - #60729 (Expand dynamic drop tests for cases in #47949)
 - #61263 (Don't generate div inside header (h4/h3/h...) elements)
 - #61364 (Stabilize reverse_bits feature)
 - #61375 (Make "panic did not include expected string" message consistent)
 - #61387 (Remove ty::BrFresh and RegionConstraintCollector::new_bound)
 - #61389 (Remove GlobalArenas and use Arena instead)
 - #61391 (Doc comment fixes for `rustc::mir::interpret::InterpretCx`)
 - #61403 (Remove unnecessary `-Z continue-parse-after-error` from tests)

Failed merges:

r? @ghost

Author: bors

src/libcore/lib.rs

@@ -120,7 +120,6 @@
 #![feature(const_str_len)]
 #![feature(const_int_conversion)]
 #![feature(const_transmute)]
-#![feature(reverse_bits)]
 #![feature(non_exhaustive)]
 #![feature(structural_match)]
 #![feature(abi_unadjusted)]

src/libcore/num/mod.rs

@@ -463,15 +463,12 @@ assert_eq!(m, ", $swapped, ");
 Basic usage:
 
 ```
-#![feature(reverse_bits)]
-
 let n = ", $swap_op, stringify!($SelfT), ";
 let m = n.reverse_bits();
 
 assert_eq!(m, ", $reversed, ");
 ```"),
-            #[unstable(feature = "reverse_bits", issue = "48763")]
-            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[stable(feature = "reverse_bits", since = "1.37.0")]
             #[inline]
             #[must_use]
             pub const fn reverse_bits(self) -> Self {
@@ -2514,14 +2511,12 @@ assert_eq!(m, ", $swapped, ");
 Basic usage:
 
 ```
-#![feature(reverse_bits)]
-
 let n = ", $swap_op, stringify!($SelfT), ";
 let m = n.reverse_bits();
 
 assert_eq!(m, ", $reversed, ");
 ```"),
-            #[unstable(feature = "reverse_bits", issue = "48763")]
+            #[stable(feature = "reverse_bits", since = "1.37.0")]
             #[inline]
             #[must_use]
             pub const fn reverse_bits(self) -> Self {