Add FIXME for leading '.' sign of a symbol

Author: Kai Luo

src/symbolize/gimli/xcoff.rs

@@ -133,6 +133,10 @@ impl<'a> Object<'a> {
         };
         let sym = self.syms.get(i)?;
         if (sym.address..sym.address + sym.size).contains(&addr) {
+            // FIXME: Should we trim the leading '.' of
+            // the symbol of a function entry?
+            // If not, the rust mangler might not work properly.
+            // Or we should update rust mangler to trim the leading '.'?
             Some(sym.name.trim_start_matches(".").as_bytes())
         } else {
             None