Make sure we correctly merge all N_FUN symbols with non-stab entries even if there are multiple symbols with the same name.

<rdar://problem/15831292>



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@199344 91177308-0d34-0410-b5e6-96231b3b80d8
If a library has no N_FUN symbols we don't succeed in finding resolver symbols, now we do.

<rdar://problem/15831334>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@199345 91177308-0d34-0410-b5e6-96231b3b80d8