[llvm-branch-commits] [sanitizer] Switch from lazy `ThreadDescriptorSize` (PR #108923)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/108923

`ThreadDescriptorSize` uses `dlsym` which may use
malloc in unexpected time.

It's relatively easy to init size with regular
init.

This reverts commit 9f40cadf1bfd2cc5baf3058b13a554c7535f9acf.