[asan] Fix pthread_create interceptor

AsanThread::Destroy implementation expected to be called on
child thread.

I missed authors concern regarding this reviewing D95184.

Reviewed By: delcypher

Differential Revision: https://reviews.llvm.org/D95731

GitOrigin-RevId: 9da05cf6ed16e8b8c0829d1fb34be3cdcad85d1c
4 files changed