tcg: Fix missing checks and clears in tcg_gen_gvec_dup_mem

tcg: Fix missing checks and clears in tcg_gen_gvec_dup_mem

The paths through tcg_gen_dup_mem_vec and through MO_128 were
missing the check_size_align.  The path through MO_128 was also
missing the expand_clr.  This last was not visible because the
only user is ARM SVE, which would set oprsz == maxsz, and not
require the clear.

Fix by adding the check_size_align and using do_dup directly
instead of duplicating the check in tcg_gen_gvec_dup_{i32,i64}.

Signed-off-by: Richard Henderson <[email protected]>