Here is a simple minimal program that does what we want. Instead of taking
minutes to compare mesa's output, and crashing on binary files (like spiff
does), this take < .02s in the common case and doesn't crash.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12926 91177308-0d34-0410-b5e6-96231b3b80d8
