powerpc: Add atomics tests

Add some tests for larx/stcx. operations for certain edge cases including
migration, as well as some simple performance tests.

Signed-off-by: Nicholas Piggin <npiggin@gma

powerpc: Add atomics tests

Add some tests for larx/stcx. operations for certain edge cases including
migration, as well as some simple performance tests.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240612052322.218726-3-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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