<rdar://problem/10103468>

I started work on being able to add symbol files after a debug session
had started with a new "target symfile add" command and quickly ran into
problems with stale Address objects in breakpoint locations that had 
lldb_private::Section pointers into modules that had been removed or 
replaced. This also let to grabbing stale modules from those sections. 
So I needed to thread harded the Address, Section and related objects.

To do this I modified the ModuleChild class to now require a ModuleSP
on initialization so that a weak reference can created. I also changed
all places that were handing out "Section *" to have them hand out SectionSP.
All ObjectFile, SymbolFile and SymbolVendors were inheriting from ModuleChild
so all of the find plug-in, static creation function and constructors now
require ModuleSP references instead of Module *. 

Address objects now have weak references to their sections which can
safely go stale when a module gets destructed. 

This checkin doesn't complete the "target symfile add" command, but it
does get us a lot clioser to being able to do such things without a high
risk of crashing or memory corruption.

llvm-svn: 151336

lldb/source/Core/DataExtractor.cpp

@@ -1366,8 +1366,7 @@ DataExtractor::Dump (Stream *s,
                 lldb_private::Address so_addr;
                 if (!target_sp->GetSectionLoadList().ResolveLoadAddress(addr, so_addr))
                 {
-                    so_addr.SetOffset(addr);
-                    so_addr.SetSection(NULL);
+                    so_addr.SetRawAddress(addr);
                 }
 
                 size_t bytes_consumed = disassembler_sp->DecodeInstructions (so_addr, *this, start_offset, item_count, false);