This fixes two issues with the POSIX dynamic loader:
1. existing breakpoints weren't being re-resolved after the sections of a library were loaded (ie. through dlopen).
2. loaded sections weren't being removed after a shared library had been unloaded.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@190727 91177308-0d34-0410-b5e6-96231b3b80d8