[NFC][Asan] Remove from_memalign and rz_log

Before D87643 they where used to optimize UsedSize(). Which was
called frequently from leak scanner.
It was also used for calls from QuarantineCallback
but we have heavy get_allocator().Deallocate call there anyway.

Depends on D87643.

Reviewed By: morehouse

Differential Revision: https://reviews.llvm.org/D87644