target-ppc: implement vnegw/d instructions
Vector Integer Negate Instructions: vnegw: Vector Negate Word vnegd: Vector Negate Doubleword Signed-off-by: NNikunj A Dadhania <nikunj@linux.vnet.ibm.com> Reviewed-by: NThomas Huth <thuth@redhat.com> Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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