The definition of INDEX_op_dupi_vec is that it operates on
units of tcg_target_ulong -- in this case 32 bits.  It does
not work to use this for a uint64_t value that happens to be
small enough to fit in tcg_target_ulong.

Fixes: d2fd745f
Fixes: db432672
Cc: qemu-stable@nongnu.org
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>