Auto merge of #132662 - RalfJung:const-panic-inlining, r=<try>

tweak attributes for const panic macro

Let's do some random mutations of this macro to see if that can re-gain the perf lost in #132542.

Author: bors

library/core/src/macros/mod.rs

@@ -40,7 +40,7 @@ pub macro const_panic {
         // add the `rustc_allow_const_fn_unstable`. This is okay to do
         // because both variants will panic, just with different messages.
         #[rustc_allow_const_fn_unstable(const_eval_select)]
-        #[inline(always)]
+        #[inline]
         #[track_caller]
         #[cfg_attr(bootstrap, rustc_const_stable(feature = "const_panic", since = "CURRENT_RUSTC_VERSION"))]
         const fn do_panic($($arg: $ty),*) -> ! {