Visit template arguments in toobj.d to fix linker error

Author: CHIKI Badreddine

compiler/src/dmd/glue/toobj.d

@@ -815,6 +815,15 @@ void toObjFile(Dsymbol ds, bool multiobj)
                 }
                 //printf("TemplateInstance.toObjFile(%p, '%s')\n", ti, ti.toPrettyChars());
 
+                if (ti.tiargs)
+                {
+                    foreach (o; *ti.tiargs)
+                    {
+                        if (auto s = isDsymbol(o))
+                            s.accept(this);
+                    }
+                }
+
                 if (multiobj)
                 {
                     // Append to list of object files to be written later
@@ -832,6 +841,15 @@ void toObjFile(Dsymbol ds, bool multiobj)
             //printf("TemplateMixin.toObjFile('%s')\n", tm.toChars());
             if (!isError(tm))
             {
+                if (tm.tiargs)
+                {
+                    foreach (o; *tm.tiargs)
+                    {
+                        if (auto s = isDsymbol(o))
+                            s.accept(this);
+                    }
+                }
+
                 tm.members.foreachDsymbol( (s) { s.accept(this); } );
             }
         }