Add missing use_srcloc in postopt and regalloc passes

cranelift/codegen/src/regalloc/spilling.rs

@@ -420,6 +420,7 @@ impl<'a> Context<'a> {
         // secondary `opidx` key makes it possible to use an unstable (non-allocating) sort.
         self.reg_uses.sort_unstable_by_key(|u| (u.value, u.opidx));
 
+        self.cur.use_srcloc(inst);
         for i in 0..self.reg_uses.len() {
             let ru = self.reg_uses[i];