[llvm] [GlobalISel] Preserve cache hint metadata through IRTranslator (PR #224522)

[Yonah Goldberg via llvm-commits]

YonahGoldberg wrote:

@kmclaughlin-arm I don't know what other GISEL reviewers to add so feel free to add more yourself, thanks!

https://github.com/llvm/llvm-project/pull/224522