fix(core): don't inline the inner functions of const_for_times!

Implements a work-around for infinite recursion in the MIR inliner
([rust-lang/rust#100476][1]).

Since they are only called at compile time, this change will not cause
a runtime performance or code size regression.

[1]: rust-lang/rust#100476

Author: yvt

src/r3_core/src/utils/for_times.rs

@@ -146,15 +146,13 @@ macro_rules! const_for_times {
     ) => {{
         use $crate::utils::for_times::{Nat, U, IncrSat};
 
-        #[inline(always)]
         const fn iter_inner<
             $(  $iter_gparam $($iter_gparam_bounds)*  ,)*
             $i: Nat
         >($ctx_param: $iter_ctx_ty) {
             $($iter)*
         }
 
-        #[inline(always)]
         const fn iter_outer<
             $(  $iter_gparam $($iter_gparam_bounds)*  ,)*
             Counter: Nat,