Fix regression in r216520: don't apply nonnull to non-pointer function
parameters in the IR.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@216574 91177308-0d34-0410-b5e6-96231b3b80d8
Update for llvm API change.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@216576 91177308-0d34-0410-b5e6-96231b3b80d8
Add tests for variadic functions versus attribute nonnull in the static analyzer.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@216577 91177308-0d34-0410-b5e6-96231b3b80d8