[PATCH] D150951: [AArch64][SME2/SVE2p1] Add predicate-as-counter intrinsics for sel

[Sander de Smalen via Phabricator via llvm-commits]

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These intrinsics are used to implement the sel intrinsics that selects
a tuple of 2 or 4 values based on a predicate-as-counter operand, e.g.

  __attribute__((arm_streaming))
  svuint8x2_t svsel[_u8_x2](svcount_t png, svuint8x2_t zn, svuint8x2_t zm);
  
  __attribute__((arm_streaming))
  svuint8x4_t svsel[_u8_x4](svcount_t png, svuint8x4_t zn, svuint8x4_t zm);

As described in https://github.com/ARM-software/acle/pull/217


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150951

Files:
  llvm/include/llvm/IR/IntrinsicsAArch64.td
  llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
  llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td
  llvm/test/CodeGen/AArch64/sve2p1-intrinsics-selx2.ll
  llvm/test/CodeGen/AArch64/sve2p1-intrinsics-selx4.ll

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