tcg/optimize: Handle or r,a,a with constant a

As seen with ubuntu-5.10-live-powerpc.iso.

Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>

tcg/optimize.c

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 067917c..37c1110 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -980,8 +980,11 @@
             if (temps_are_copies(args[1], args[2])) {
                 if (temps_are_copies(args[0], args[1])) {
                     tcg_op_remove(s, op);
-                } else {
+                } else if (temps[args[1]].state != TCG_TEMP_CONST) {
                     tcg_opt_gen_mov(s, op, args, opc, args[0], args[1]);
+                } else {
+                    tcg_opt_gen_movi(s, op, args, opc,
+                                     args[0], temps[args[1]].val);
                 }
                 continue;
             }