[clang] [llvm] [AArch64][SVE] Lower unpredicated loads/stores as LDR/STR. (PR #127837)

[Paul Walker via llvm-commits]

https://github.com/paulwalker-arm approved this pull request.

Based on the previous conversation I'm happy enough.  I don't think the existing bug needs to hold up this PR and I can take a look at fixing it once this lands.

Please keep an ear out for any performance regression reports just in case there ends up being something we've missed that might suggest the fill/spill instructions should not be used this aggressively.

https://github.com/llvm/llvm-project/pull/127837