<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
diff --git a/lldb/source/Symbol/LineEntry.cpp b/lldb/source/Symbol/LineEntry.cpp
index d4b5686..10dc552 100644
--- a/lldb/source/Symbol/LineEntry.cpp
+++ b/lldb/source/Symbol/LineEntry.cpp
@@ -29,7 +29,7 @@
 
 LineEntry::LineEntry
 (
-    lldb_private::Section *section,
+    const lldb::SectionSP &section_sp,
     lldb::addr_t section_offset,
     lldb::addr_t byte_size,
     const FileSpec &_file,
@@ -41,7 +41,7 @@
     bool _is_epilogue_begin,
     bool _is_terminal_entry
 ) :
-    range(section, section_offset, byte_size),
+    range(section_sp, section_offset, byte_size),
     file(_file),
     line(_line),
     column(_column),