tcg/optimize: Use fold_xx_to_i for rem

Recognize the constant function for remainder.

Suggested-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/optimize.c

@@ -1624,7 +1624,11 @@ static bool fold_qemu_st(OptContext *ctx, TCGOp *op)
 
 static bool fold_remainder(OptContext *ctx, TCGOp *op)
 {
-    return fold_const2(ctx, op);
+    if (fold_const2(ctx, op) ||
+        fold_xx_to_i(ctx, op, 0)) {
+        return true;
+    }
+    return false;
 }
 
 static bool fold_setcond(OptContext *ctx, TCGOp *op)