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UserspaceEmulator: Implement a proper VM allocator
This patch brings Kernel::RangeAllocator to UserspaceEmulator in a slightly simplified form. It supports the basic three allocation types needed by virt$mmap(): allocate_anywhere, allocate_specific, and allocate_randomized. Porting virt$mmap() and virt$munmap() to use the allocator makes UE work correctly once again. :^)
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/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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