selftests/powerpc: Update memcmp_64 selftest for VMX implementation
This patch reworked selftest memcmp_64 so that memcmp selftest can cover more test cases. It adds testcases for: - memcmp over 4K bytes size. - s1/s2 with different/random offset on 16 bytes boundary. - enter/exit_vmx_ops pairness. Signed-off-by: NSimon Guo <wei.guo.simon@gmail.com> [mpe: Add -maltivec to fix build on some toolchains] Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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