[Unroll] When completely unrolling the loop, replace conditinal branches with unconditional.

Nothing is expected to change, except we do less redundant work in
clean-up.

Reviewers: hfinkel

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D12951

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248444 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed