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H A Dtcg.c1305c451e67e3def030720013415103f5e0f5e11 Tue Oct 02 18:32:29 UTC 2012 Richard Henderson <rth@twiddle.net> tcg: Optimize half-dead add2/sub2

When x86_64 guest is not in 64-bit mode, the high-part of the 64-bit
add is dead. When the host is 32-bit, we can simplify to 32-bit
arithmetic.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>