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H A Dtranslate.cdc0ad844 Sun Feb 26 22:57:57 CST 2017 Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> target/ppc: update overflow flags for add/sub

* SO and OV reflects overflow of the 64-bit result in 64-bit mode and
overflow of the low-order 32-bit result in 32-bit mode

* OV32 reflects overflow of the low-order 32-bit independent of the mode

Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>