[Ping, ARM]PR53189: optimizations of 64bit logic operation with constant

[Carrot Wei]

Hi

The following patches implemented the optimizations suggested by
PR53189, optimizations of 64bit logic operation with constant. Could
any maintainer help to review it?

http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00087.html
http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00169.html
http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00226.html

thanks
Carrot