[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
1 file changed
