tree d2884e4e8707ee8f565969e3c1eab47ac27f797a
parent 2366b8d3df8c1a3a1cca46634fea3cbee3f7647d
author Marco Vanotti <mvanotti@google.com> 1611601729 -0800
committer Copybara-Service <copybara-worker@google.com> 1611865891 -0800

[sanitizer][fuchsia] Implement ReleaseMemoryPagesToOS

The `zx_vmar_op_range` allows us to decommit memory pages without
needing a handle to the underlying vmo, as long as we have a handle to
a vmar that contains this mapping. This allows us to implement the
`ReleaseMemoryPagesToOS` function by decommitting the memory using a
handle to the root vmar.

Reviewed By: mcgrathr

Differential Revision: https://reviews.llvm.org/D95384

GitOrigin-RevId: 98c21ae7a8ec587febc899753b63054ae9aea9d6