LLDB now handles DW_TAG_unspecified_parameters nested inside function prototypes and we now mark the function prototypes as being variadic.

<rdar://problem/16149526> 



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@202061 91177308-0d34-0410-b5e6-96231b3b80d8