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bmalloc: vm allocations should plant guard pages
https://bugs.webkit.org/show_bug.cgi?id=156937 Reviewed by Michael Saboff. * bmalloc/Object.h: (bmalloc::Object::operator-): Added a - helper. * bmalloc/VMAllocate.h: (bmalloc::vmRevokePermissions): Added a helper to revoke permissions on a VM region. We use this for guard pages. * bmalloc/VMHeap.cpp: (bmalloc::VMHeap::allocateSmallChunk): Add guard pages to the start and end of the chunk. Note that we don't guard large chunks becuase we need to be able to merge them. Otherwise, we will run out of virtual addresses. Canonical link: https://commits.webkit.org/175048@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@199936 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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