ART: GenLongArith has to clobber same operands for 2-op instr

When we generate code for 'add-long/2addr v4, v4' and v4 is in
memory, we load v4 in a physical register, do operation and
store result in memory. After that, we should clobber the
physical register because it is not valid anymore.

Signed-off-by: nikolay serdjuk <nikolay.y.serdjuk@intel.com>

(cherry picked from commit 6b9356cf)

Bug: 18671047
Bug: https://code.google.com/p/android/issues/detail?id=81542
Change-Id: Ie11e29cd32358ddbdccf66eaad46aa07f1269133