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In the future, newly created VMOs on Fuchsia will not be mappable as executable by default. In preparation for that, start using zx_vmo_replace_as_executable to mark Fuchsia's VMOs as executable as needed. SEC-42 TEST=CQ Change-Id: I9df86bbb33b02042260727d64e74b7146eb1d1a6 Reviewed-on: https://dart-review.googlesource.com/76304 Reviewed-by: Zach Anderson <zra@google.com> Commit-Queue: Zach Anderson <zra@google.com>