Add a utility to reduce GlobalISel tests
Add a utility to reduce GlobalISel tests

Summary: This patch adds a script to reduce GlobalISel failures using bugpoint.

Reviewers: bogner

Reviewed By: bogner

Subscribers: MatzeB, qcolombet, rovka, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D41876

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@323248 91177308-0d34-0410-b5e6-96231b3b80d8

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