The following vector insert instructions are added from ISA 3.0.

vinsertb - Vector Insert Byte
vinserth - Vector Insert Halfword
vinsertw - Vector Insert Word
vinsertd - Vector Insert Doubleword
Signed-off-by: NRajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>