[llvm-branch-commits] [NFC][lsan] Restructure loop in ProcessThreads (PR #112609)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/112609

The goal is to move `SuspendedThreadsList` into
the begining of the loop, and prepare for
extraction the rest of the loop body into a
function.