[compiler-rt] [Sanitizers][Apple] Fix logic bugs that break RestrictMemoryToMaxAddress (PR #124712)

[Dan Liew via llvm-commits]

delcypher wrote:

@thetruestblue I think it would be good to also explain a little in the commit message how this ended up working. The current description makes it sound like this never worked which I'm pretty sure isn't the case.

https://github.com/llvm/llvm-project/pull/124712