target/arm: Fix PSEL size operands to tcg_gen_gvec_ands

Gvec only operates on size 8 and multiples of 16.
Predicates may be any multiple of 2.
Round up the size using the appropriate function.

Cc: [email protected]
Fixes: 598ab0b ("target/arm: Implement PSEL")
Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
Message-id: [email protected]
Signed-off-by: Peter Maydell <[email protected]>
(cherry picked from commit 3801c5b75ffc60957265513338e8fd5f8b6ce8a1)
Signed-off-by: Michael Tokarev <[email protected]>

Author: rth7680

target/arm/tcg/translate-sve.c

@@ -7282,6 +7282,7 @@ static bool trans_PSEL(DisasContext *s, arg_psel *a)
     tcg_gen_neg_i64(tmp, tmp);
 
     /* Apply to either copy the source, or write zeros. */
+    pl = size_for_gvec(pl);
     tcg_gen_gvec_ands(MO_64, pred_full_reg_offset(s, a->pd),
                       pred_full_reg_offset(s, a->pn), tmp, pl, pl);
     return true;