Rollup merge of rust-lang#79968 - bjorn3:better_drop_glue_debuginfo, …

…r=matthewjasper

Improve core::ptr::drop_in_place debuginfo

* Use span of the dropped type as function span when possible.
* Rename symbol from `core::ptr::drop_in_place::$hash` to `{{drop}}::<$TYPE>::$hash`.

Fixes rust-lang#77465

(I haven't yet updated the tests)

compiler/rustc_symbol_mangling/src/legacy.rs

@@ -56,7 +56,15 @@ pub(super) fn mangle(
  let hash = get_symbol_hash(tcx, instance, instance_ty, instantiating_crate);
 
  let mut printer = SymbolPrinter { tcx, path: SymbolPath::new(), keep_within_component: false }
- .print_def_path(def_id, &[])
+ .print_def_path(
+ def_id,
+ if let ty::InstanceDef::DropGlue(_, _) = instance.def {
+ // Add the name of the dropped type to the symbol name
+ &*instance.substs
+ } else {
+ &[]
+ },
+ )
  .unwrap();
 
  if let ty::InstanceDef::VtableShim(..) = instance.def {