sw: work around what seems to be a gcc-4.8 compiler bug

	Thread 1 "soffice.bin" received signal SIGSEGV, Segmentation fault.
	(anonymous namespace)::print_type<15> (ctx=..., info=0x7fffffff7f90, unknown_name=...) at ../../../../../libstdc++-v3/src/c++11/debug.cc:641
	641     ../../../../../libstdc++-v3/src/c++11/debug.cc: No such file or directory.
	(gdb) up
	#1  0x00007ffff6abb008 in (anonymous namespace)::print_description (ctx=..., inst=...) at ../../../../../libstdc++-v3/src/c++11/debug.cc:817
	817     in ../../../../../libstdc++-v3/src/c++11/debug.cc
	(gdb)
	#2  0x00007ffff6abc7aa in (anonymous namespace)::print_description (param=..., ctx=...) at ../../../../../libstdc++-v3/src/c++11/debug.cc:835
	835     in ../../../../../libstdc++-v3/src/c++11/debug.cc
	(gdb)
	#3  __gnu_debug::_Error_formatter::_M_error (this=0x7fffffff7af0) at ../../../../../libstdc++-v3/src/c++11/debug.cc:1061
	1061    in ../../../../../libstdc++-v3/src/c++11/debug.cc
	(gdb)
	#4  0x00007fffca2b6313 in __gnu_debug::operator!=<__gnu_cxx::__normal_iterator<SwAnchoredObject* const*, std::__cxx1998::vector<SwAnchoredObject*, std::allocator<SwAnchoredObject*> > >, std::__debug::vector<SwAnchoredObject*, std::allocator<SwAnchoredObject*> > > (__lhs=0x0, __rhs=invalid iterator) at /usr/include/c++/4.8/debug/safe_iterator.h:535
	535           _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(),
	(gdb)
	#5  0x00007fffca7f3de2 in SwAnchoredObject::UpdateObjInSortedList (this=0x1fa6fd8) at /git/libreoffice/master/sw/source/core/layout/anchoredobject.cxx:629
	629                     for (SwAnchoredObject* pAnchoredObj : *pObjs)

Given that valgrind doesn't point out anything and the old and the new code is
meant to be the same, my only guess is that the baseline gcc has some codegen
bug. This happens reasonably frequently, current bugdoc was a DOCX file
with 4 shapes anchored to the same paragraph, affecting only dbgutil
builds, it seems.

Change-Id: I2316e25eea87f2aa5736576d5168e113480f80e4
Reviewed-on: https://gerrit.libreoffice.org/49631Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

sw/source/core/layout/anchoredobject.cxx

@@ -626,8 +626,9 @@ void SwAnchoredObject::UpdateObjInSortedList()
             {
                 const SwSortedObjs* pObjs = GetAnchorFrame()->GetDrawObjs();
                 // determine start index
-                for (SwAnchoredObject* pAnchoredObj : *pObjs)
+                for (auto it = pObjs->begin(); it != pObjs->end(); ++it)
                 {
+                    SwAnchoredObject* pAnchoredObj = *it;
                     if ( pAnchoredObj->ConsiderObjWrapInfluenceOnObjPos() )
                         pAnchoredObj->InvalidateObjPosForConsiderWrapInfluence();
                     else