[analyzer] [PointerArithChecker] do not warn on indexes into vector types rdar://35041502 Differential Revision: https://reviews.llvm.org/D44172 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@326952 91177308-0d34-0410-b5e6-96231b3b80d8