tcg-ppc64: Fix add2_i64
add2_i64 was adding the lower double word to the upper double word of each input. Fix this so we add the lower double words, then the upper double words with carry propagation. Cc: qemu-stable@nongnu.org Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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