<rdar://problem/12524607>

Flush the process when symbols are loaded/unloaded manually. This was going on in:
- "target modules load" command
- SBTarget::SetSectionLoadAddress(...)
- SBTarget::ClearSectionLoadAddress(...)
- SBTarget::SetModuleLoadAddress(...)
- SBTarget::ClearModuleLoadAddress(...)



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@173745 91177308-0d34-0410-b5e6-96231b3b80d8