Fix: SLPVectorizer tried to move an instruction which was replaced by a vector instruction.

For a detailed description of the problem see the comment in the test file.
The problematic moveBefore() calls are not required anymore because the new
scheduling algorithm ensures a correct ordering anyway.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216656 91177308-0d34-0410-b5e6-96231b3b80d8