tests: add tcg coverage for fixed mremap bugs These tests cover the first two fixes in this patch series. The final patch is not covered because the bug it fixes is not easily observable by the guest. Signed-off-by: Matthew Lugg <mlugg@mlugg.co.uk> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20251117170954.31451-5-mlugg@mlugg.co.uk>