[SimplifyCFG] Fix for non-determinism in codegen
[SimplifyCFG] Fix for non-determinism in codegen

Summary: This patch fixes issues in codegen uncovered due to https://reviews.llvm.org/D26718

Reviewers: majnemer, chenli, davide

Reviewed By: davide

Subscribers: davide, arsenm, llvm-commits

Differential Revision: https://reviews.llvm.org/D26726

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@301222 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm