Currently, if TSan needs to disable ASLR but is unable to do so, it
aborts with a cryptic message:
```
ThreadSanitizer: CHECK failed: tsan_platform_linux.cpp:290 "((personality(old_personality | ADDR_NO_RANDOMIZE))) != ((-1))"
```
and a segfault
(https://github.com/google/sanitizers/issues/837#issuecomment-2939267531).
This patch replaces the CHECK with more user-friendly diagnostics and
suggestions via printf, followed by Die().
96c1fd40bc