[SimplifyCFG] Fix nondeterministic iteration order

We iterate over the result from SafeToMergeTerminators, so make it a SmallSetVector instead of a SmallPtrSet.

Should fix stage3 convergence builds.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280342 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed