pco: experimentally propagate olchk mod for fwd prop opt

Signed-off-by: Simon Perretta <simon.perretta@imgtec.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36412>

src/imagination/pco/pco_opt.c

@@ -393,6 +393,12 @@ static inline bool try_fwd_prop_instr(pco_instr **writes, pco_instr *instr)
       /* TODO: types? */
       *psrc = repl;
 
+      if (pco_instr_has_olchk(parent_instr) &&
+          pco_instr_get_olchk(parent_instr)) {
+         assert(pco_instr_has_olchk(instr));
+         pco_instr_set_olchk(instr, true);
+      }
+
       progress = true;
    }