[clang] [llvm] [AArch64][SME] Remove immediate argument restriction for svldr and svstr (PR #68565)

[Sam Tebbs via cfe-commits]

SamTebbs33 wrote:

I've changed the approach to consider immediates outside of 0-15 and fixed the issue of the tile slice not being updated. Please let me know what you think.

https://github.com/llvm/llvm-project/pull/68565