tcg/aarch64: Fix addsub2 for 0+C
When al == xzr, we cannot use addi/subi because that encodes xsp. Force a zero into the temp register for that (rare) case. Signed-off-by: NRichard Henderson <rth@twiddle.net> Message-Id: <20161207180727.6286-2-rth@twiddle.net> (cherry picked from commit b1eb20da) Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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