Adding support for ZExt lowering for destination types beyond the existing support for (8|16) x i32
[AArch64] Patch for lowering zext instructions to 'tbl' for (8|16)xi8 -> (8|16)xi32 conversions in D120571 is extended to support zext to 'tbl' lowering for Y x i8 to Y x i8X. Any arbitrary number of vector elements & any destination element type whose size is a multiple of 8, greater than 16 and less than 64, is allowed for this transformation.
Related microbenchmarks are in D136274 & D138059
Depends on D120571