[llvm] [JITLink] Always unmap standard segments in InProcessMemoryManager::deallocate (PR #81943)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

I'm not sure how to add new tests for this (it passes existing x86_64 JITLink tests though). I pin-pointed this issue by checking the `/proc/<PID>/maps` on Linux but I guess we can't add that as a test.

https://github.com/llvm/llvm-project/pull/81943