target-ppc: add vextu[bhw][lr]x instructions
vextublx: Vector Extract Unsigned Byte Left vextuhlx: Vector Extract Unsigned Halfword Left vextuwlx: Vector Extract Unsigned Word Left vextubrx: Vector Extract Unsigned Byte Right-Indexed VX-form vextuhrx: Vector Extract Unsigned Halfword Right-Indexed VX-form vextuwrx: Vector Extract Unsigned Word Right-Indexed VX-form Signed-off-by: NAvinesh Kumar <avinesku@linux.vnet.ibm.com> Signed-off-by: NHariharan T.S. <hari@linux.vnet.ibm.com> [ implement using int128_rshift ] Signed-off-by: NNikunj A Dadhania <nikunj@linux.vnet.ibm.com> Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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