Prefer prefix ++/-- operators for non-primitive types.

Change-Id: I9be657cd0b5ed964db8db2ca28fd2874ae5406aa
cppcheck: performance
Reviewed-on: https://gerrit.libreoffice.org/32431Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

include/cppuhelper/interfacecontainer.h

@@ -410,7 +410,7 @@ private:
             equalImpl equal;
             if( equal( iter->first, rKey ) )
                 break;
-            iter++;
+            ++iter;
         }
         return iter;
     }

sw/inc/dbgoutsw.hxx

@@ -84,7 +84,7 @@ OUString lcl_dbg_out(const std::unordered_map<tKey, tMember, fHashFunction> & rM
 
     typename std::unordered_map<tKey, tMember, fHashFunction>::const_iterator aIt;
 
-    for (aIt = rMap.begin(); aIt != rMap.end(); aIt++)
+    for (aIt = rMap.begin(); aIt != rMap.end(); ++aIt)
     {
         if (aIt != rMap.begin())
             aResult += ", ";