common: add memory dirtying vs migration test

This test stores to a bunch of pages and verifies previous stores,
while being continually migrated. Default runtime is 5 seconds.

Add this test to ppc

common: add memory dirtying vs migration test

This test stores to a bunch of pages and verifies previous stores,
while being continually migrated. Default runtime is 5 seconds.

Add this test to ppc64 and s390x builds. This can fail due to a QEMU
TCG physical memory dirty bitmap bug, so it is not enabled in unittests
for TCG yet.

The selftest-migration test time is reduced significantly because
this test

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240405083539.374995-8-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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