Fix error handling for the AppleGetQueues and AppleGetPendingItems
ClangFunctions if the clang function compilation fails for any reason.
<rdar://problem/16793965> 


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@211549 91177308-0d34-0410-b5e6-96231b3b80d8