[llvm] [AArch64][SVE] Handle some cases of uzp1/reinterpret from svbool in isZeroingInactiveLanes (PR #78623)

[Usman Nadeem via llvm-commits]

================
@@ -283,6 +283,24 @@ static bool isZeroingInactiveLanes(SDValue Op) {
     switch (Op.getConstantOperandVal(0)) {
     default:
       return false;
+
+    case Intrinsic::aarch64_sve_uzp1:
+      return isZeroingInactiveLanes(Op.getOperand(1)) &&
+             isZeroingInactiveLanes(Op.getOperand(2));
----------------
UsmanNadeem wrote:

https://reviews.llvm.org/D141469#4057420 has some comments by @paulwalker-arm about how the actual "block" of type d/s/h/b is copied unmodified and there may be some bits in there that don't belong to the predicate type.

https://github.com/llvm/llvm-project/pull/78623