tools: add VMA merge tests

Add a variety of VMA merge unit tests to assert that the behaviour of VMA
merge is correct at an abstract level and VMAs are merged or not merged as
expected.

These are intentionally added _before_ we start refactoring vma_merge() in
order that we can continually assert correctness throughout the rest of
the series.

In order to reduce churn going forward, we backport the vma_merge_struct
data type to the test code which we introduce and use in a future commit,
and add wrappers around the merge new and existing VMA cases.

Link: https://lkml.kernel.org/r/1c7a0b43cfad2c511a6b1b52f3507696478ff51a.1725040657.git.lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <[email protected]>
Reviewed-by: Liam R. Howlett <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Bert Karwatzki <[email protected]>
Cc: Jeff Xu <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Paul Moore <[email protected]>
Cc: Sidhartha Kumar <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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