[PATCH v3] aarch64: thunderx2 memcpy branches reordering

[Anton Youdkevitch]

The "ext" chunk changes are:

1. Always taken conditional branch at the beginning is
removed.
2. Epilogue code is placed after the end of the loop to
reduce the number of branches.
2. The redundant "mov" instruction inside the loop is
removed.
3. Invariant code in the loop epilogue is no more
repeated for each chunk.

make check showed no regressions.

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