[polly] Fix non-determinism in IslNodeBuilder.

The iteration order of OutsideLoopIterations matters for
IslNodeBuilder::getReferencesInSubtree, which inserts the values from
the map into a SetVector, which is eventually used to construct the
type of the context for parallel loops.



git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@360723 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed