[compiler-rt] [scudo] Avoid splitting aligned allocations on Trusty (PR #69281)

[via llvm-commits]

ChiaHungDuan wrote:

Given that Trusty doesn't enable the secondary cache, `mapSecondary` will only be used while mapping new pages in `MapAllocator<Config>::allocate`. It's unclear to me what goal of this change and what benefit we'll get on Trusty. Could you share more details behind this?

https://github.com/llvm/llvm-project/pull/69281