Fix a crash in SjLjEHPrepare::lowerIncomingArguments caused by treating VectorType like an aggregate. It's first-class! <rdar://problem/15854596> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199768 91177308-0d34-0410-b5e6-96231b3b80d8