Resubmitting 240466 after fixing the linux test suite failures.

A few extras were fixed

- Symbol::GetAddress() now returns an Address object, not a reference. There were places where people were accessing the address of a symbol when the symbol's value wasn't an address symbol. On MacOSX, undefined symbols have a value zero and some places where using the symbol's address and getting an absolute address of zero (since an Address object with no section and an m_offset whose value isn't LLDB_INVALID_ADDRESS is considered an absolute address). So fixing this required some changes to make sure people were getting what they expected. 
- Since some places want to access the address as a reference, I added a few new functions to symbol:
    Address &Symbol::GetAddressRef();
    const Address &Symbol::GetAddressRef() const;

Linux test suite passes just fine now.

<rdar://problem/21494354>

llvm-svn: 240702

lldb/source/API/SBThread.cpp

@@ -114,13 +114,13 @@ SBThread::GetQueue () const
         else
         {
             if (log)
-                log->Printf ("SBThread(%p)::GetQueueKind() => error: process is running",
+                log->Printf ("SBThread(%p)::GetQueue() => error: process is running",
                              static_cast<void*>(exe_ctx.GetThreadPtr()));
         }
     }
 
     if (log)
-        log->Printf ("SBThread(%p)::GetQueueKind () => SBQueue(%p)",
+        log->Printf ("SBThread(%p)::GetQueue () => SBQueue(%p)",
                      static_cast<void*>(exe_ctx.GetThreadPtr()), static_cast<void*>(queue_sp.get()));
 
     return sb_queue;