compiler-rt: Make the tests pass on AArch64 and with page size != 4096.

This makes the tests pass on my AArch64 machine with 16K pages.

Not sure why some of the AArch64-specific test failures don't seem to
occur on sanitizer-aarch64-linux. I could also reproduce them by running
buildbot_cmake.sh on my machine.

Pull Request: https://github.com/llvm/llvm-project/pull/153860

GitOrigin-RevId: 19cfc30b33df5bf121bac96d4c1aac6028df0670