[Darwin][ASan] Fix "interceptor working?" check for DriverKit platform

The previous check for interceptors used `pthread_create()` which is not
available on DriverKit.  We need an intercepted symbol that satisfies
the following constraints:

- Symbol is available in DriverKit
- Symbol is provided by simulator runtime dylibs (`dlsym()` fails to
  look up host-provided symbols)

`puts()` satisfies all of the above constraints.

rdar://87895539

Reviewed By: yln

Differential Revision: https://reviews.llvm.org/D123245