[llvm] [AArch64] Add patterns for constructive splice. (PR #113912)

[Amara Emerson via llvm-commits]

aemerson wrote:

According to this: https://developer.arm.com/documentation/ddi0602/2024-09/SVE-Instructions/SPLICE--Splice-two-vectors-under-predicate-control- the splice instructions require both SVE2 *and* SME, it looks like the splice definition currently is guarded under "SVE2OrSME".



https://github.com/llvm/llvm-project/pull/113912