[dfsan] Fix non-determinism bug in non-zero label check annotator.

We now use a std::vector instead of a DenseSet to store the list of
label checks so that we can iterate over it deterministically.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216255 91177308-0d34-0410-b5e6-96231b3b80d8
fix: SLPVectorizer crashes for unreachable blocks containing not schedulable instructions.

In unreachable blocks it's legal to have instructions like "%x = op %x".
Such instuctions are not schedulable. Therefore the SLPVectorizer has to check for
unreachable blocks and ignore them.

Fixes bug 20646.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216256 91177308-0d34-0410-b5e6-96231b3b80d8