[clang] [llvm] [AArch64] Rename memory hints to avoid clash with arm_acle.h macros (PR #226432)

[Paul Walker via llvm-commits]

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

Do you think it's worth changing arm_acle.h to use `const int` rather than a macro?

https://github.com/llvm/llvm-project/pull/226432