[AArch64][SVE] Fold predicate into compare

Codegen of added testcase before this patch:

  ptrue   p0.s
  cmpgt   p1.s, p0/z, z0.s, z1.s
  cmpge   p2.s, p0/z, z2.s, z1.s
  and     p0.b, p0/z, p1.b, p2.b
  ret

Patterns originally authored by Will Lovett.

Reviewed By: david-arm

Differential Revision: https://reviews.llvm.org/D116749