[compiler-rt] [Sanitizers] Fix fake_test_gc not working on devices (PR #91284)

[Mariusz Borsa via llvm-commits]

wrotki wrote:

The buildkite test failure is n release_shadow_space.c test from dataflow sanitizer, completely unrelated to this change, so I'm going to merge this. 

https://github.com/llvm/llvm-project/pull/91284