For logical backtrace work, lldb needs to track Module unloads etc & symoblicate an address based on a point in time

<rdar://problem/15314403> 

This patch adds a new lldb_private::SectionLoadHistory class that tracks what shared libraries were loaded given a process stop ID. This allows us to keep a history of the sections that were loaded for a time T. Many items in history objects will rely upon the process stop ID in the future.

llvm-svn: 196557

lldb/source/Core/Section.cpp

@@ -10,6 +10,7 @@
 #include "lldb/Core/Section.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Target/SectionLoadList.h"
 #include "lldb/Target/Target.h"
 
 using namespace lldb;