kmsan: Implement __msan_test_shadow()
This is needed when building OpenZFS with KMSAN enabled, as the bundled
zstd uses it.
MFC after: 1 week
(cherry picked from commit bf149f2e88cb3836e02ddabd9944eb58650a72ae)
kmsan: Implement __msan_test_shadow() Tags None Referenced Files None Subscribers None
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