[llvm] [AArch64] Forward stores of loaded i1 vectors as integer load/store pairs (PR #210535)

[Joel Walker via llvm-commits]

Joel-Wwalker wrote:

Done — split into a test-only commit with the current codegen and the change on top, so the second commit's diff shows the difference.

https://github.com/llvm/llvm-project/pull/210535