[llvm] [MC][AArch64] Segregate constant pool caches by size. (PR #86832)

[Renato Golin via llvm-commits]

https://github.com/rengolin approved this pull request.

You do end up with small bloat on your constant pool, but it's better than reading garbage. :)

I'd treat the fusion of these entries as a future optimization, since the endiannes is not a trivial thing and this fixes an actual bug with correct behaviour.

https://github.com/llvm/llvm-project/pull/86832