DBG_UTIL implementation differs only by never-wrong assert

Change-Id: Ifb879d6536c80f00da61707fb0aa0700dcd19bcc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/158288
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

sw/inc/fldbas.hxx

@@ -349,13 +349,10 @@ public:
 
     /// ResId
     SwFieldIds          Which() const
-#ifdef DBG_UTIL
-    ;       // implemented in fldbas.cxx
-#else
     {
+        assert(m_pType);
         return m_pType->Which();
     }
-#endif
 
     // TYP_ID
     SwFieldTypesEnum    GetTypeId() const;

sw/source/core/fields/fldbas.cxx

@@ -257,16 +257,6 @@ SwField::~SwField()
 {
 }
 
-// instead of indirectly via the type
-
-#ifdef DBG_UTIL
-SwFieldIds SwField::Which() const
-{
-    assert(m_pType);
-    return m_pType->Which();
-}
-#endif
-
 SwFieldTypesEnum SwField::GetTypeId() const
 {