[compiler-rt] [scudo] Change CompactPtrT and CompactPtrScale to optional (PR #90797)

[via llvm-commits]

ChiaHungDuan wrote:

Add more context, given that primary32 doesn't do pointer compaction, make them optional. This is one of the CLs to deprecate primary32. 

https://github.com/llvm/llvm-project/pull/90797