memprof: don't use thread user_id

memprof does not use user_id for anything,
so don't pass it to ThreadCreate.
Passing a random field of MemprofThread as user_id
does not make much sense anyway.

Depends on D113920.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D113921

GitOrigin-RevId: d1f72f02d00d3bc6cf5e7f77d26f21c25682064c
1 file changed