Jonas Paulsson b3bd0c37ec [SystemZ] Eliminate the need to create a zero vector by reusing the VPERM mask.
Try to avoid creating VGBMs by reusing the permutation mask if it contains a
zero. If the first byte was into (any byte of) a zero vector, then the first
byte of the mask can become zero and reused by putting the mask also as the
first operand. If there instead was a first-byte use of the other source
operand, then that zero index can be reused if the mask is placed as the
second operand.

Review: Ulrich Weigand

Differential Revision: https://reviews.llvm.org/D79925
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