Added InstCombine Transform for ((B | C) & A) | B -> B | (A & C)

Transform ((B | C) & A) | B --> B | (A & C)

Z3 Link: http://rise4fun.com/Z3/hP6p

Patch by Sonam Kumari!

Differential Revision: http://reviews.llvm.org/D4865

llvm-svn: 215619