Bin Cheng as Loop Induction Variable Optimizations maintainer

[Jeff Law]

I am pleased to announce that the GCC Steering Committee has appointed 
Bin Cheng as the IVopts maintainer.

Please join me in congratulating Bin on his new role.
Bin, please update your entry in the MAINTAINERS file.  I also believe 
you have some patches to self-approve :-)

Thanks,

Jeff