unix: fix MremapPtr test failing on NetBSD

NetBSD apparently doesn't allow remapping into used address space.
This means that the test that uses mremap to move a mmapped page
into a new address should first mmap (to reserve)
then munmap (to free) the destination.

Fixes golang/go#68180

Change-Id: If66b67e7166ca4dc4331a8cfc3e3a285416e9849
GitHub-Last-Rev: 92058c2f2525be77522762d503ac7193580f125e
GitHub-Pull-Request: golang/sys#198
Cq-Include-Trybots: luci.golang.try:x_sys-gotip-netbsd-amd64
Reviewed-on: https://go-review.googlesource.com/c/sys/+/594756
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joedian Reid <joedian@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
1 file changed
tree: 0cb657b03a2f7dea01264df86f15e2591efe5f07
  1. cpu/
  2. execabs/
  3. plan9/
  4. unix/
  5. windows/
  6. .gitattributes
  7. .gitignore
  8. codereview.cfg
  10. go.mod
  13. README.md


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