mm: add selftests for migration entries

Add some basic migration tests and in particular tests that will
stress both the pte and pmd migration entry wait paths.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Alistair Popple <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Ralph Campbell <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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