Auto merge of rust-lang#102795 - lukas-code:constify-is-aligned-via-align-offset, r=oli-obk

Constify `is_aligned` via `align_offset`

Alternative to rust-lang#102753

Make `align_offset` work in const eval (and not always return `usize::MAX`) and then use that to constify `is_aligned{_to}`.

Tracking Issue: rust-lang#104203

Author: bors

src/shims/intrinsics/mod.rs

@@ -368,11 +368,6 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             }
 
             // Other
-            "exact_div" => {
-                let [num, denom] = check_arg_count(args)?;
-                this.exact_div(&this.read_immediate(num)?, &this.read_immediate(denom)?, dest)?;
-            }
-
             "breakpoint" => {
                 let [] = check_arg_count(args)?;
                 // normally this would raise a SIGTRAP, which aborts if no debugger is connected