klzgrad 2b496e3a9b base/allocator: Revert stack scanning refactor
It is still only used by starscan, which is not used by us.

It causes hanging in pthread_getattr_np() under qemu-user, see
https://www.openwall.com/lists/musl/2017/06/15/9.

Introduced in https://chromium-review.googlesource.com/c/chromium/src/+/5371077
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