Teach CFG that 'if (x & 0)' and 'if (x * 0)' is an unfeasible branch.

Fixes <rdar://problem/11005770>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162545 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed