Rollup merge of rust-lang#118693 - saethlin:alignment-check-symbol-reachable, r=bjorn3

Tell MirUsedCollector that the pointer alignment checks calls its panic symbol

Fixes rust-lang#118683 (not an issue, but that PR is a basically a bug report)

When we had `panic_immediate_abort` start adding `#[inline]` to this panic function, builds started breaking because we failed to write up the MIR assert terminator to the correct panic shim. Things happened to work before by pure luck because without this feature enabled, the function we're inserting calls to is `#[inline(never)]` so we always generated code for it.

r? bjorn3

Author: compiler-errors

compiler/rustc_monomorphize/src/collector.rs

@@ -844,6 +844,9 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
             mir::TerminatorKind::Assert { ref msg, .. } => {
                 let lang_item = match &**msg {
                     mir::AssertKind::BoundsCheck { .. } => LangItem::PanicBoundsCheck,
+                    mir::AssertKind::MisalignedPointerDereference { .. } => {
+                        LangItem::PanicMisalignedPointerDereference
+                    }
                     _ => LangItem::Panic,
                 };
                 push_mono_lang_item(self, lang_item);