Reapply: Mark drop calls in landing pads cold instead of noinline

Co-authored-by: Max Fan <git@max.fan>
Co-authored-by: Nikita Popov <npopov@redhat.com>

src/builder.rs

@@ -1420,7 +1420,7 @@ fn cx(&self) -> &CodegenCx<'gcc, 'tcx> {
         self.cx
     }
 
-    fn do_not_inline(&mut self, _llret: RValue<'gcc>) {
+    fn apply_attrs_to_cleanup_callsite(&mut self, _llret: RValue<'gcc>) {
         // FIXME(bjorn3): implement
     }