Fix bug #307 by doing what DMD does: add the arrayop to

sc->module->importedFrom instead of sc->module. That way array ops in template
instantiations will be semantic3'ed.

dmd/arrayop.c

@@ -281,10 +281,10 @@ Expression *BinExp::arrayOp(Scope *sc)
         // special attention for array ops
         fd->isArrayOp = true;
 
-        sc->module->members->push(fd);
+        sc->module->importedFrom->members->push(fd);
 
         sc = sc->push();
-        sc->parent = sc->module;
+        sc->parent = sc->module->importedFrom;
         sc->stc = 0;
         sc->linkage = LINKd;
         fd->semantic(sc);

gen/llvmhelpers.cpp

@@ -1369,13 +1369,13 @@ bool mustDefineSymbol(Dsymbol* s)
 {
     if (FuncDeclaration* fd = s->isFuncDeclaration())
     {
-        if (fd->isArrayOp)
-            return true;
-            
         // we can't (and probably shouldn't?) define functions 
         // that weren't semantic3'ed
         if (fd->semanticRun < 4)
             return false;
+
+	if (fd->isArrayOp)
+            return true;
     }
 
     TemplateInstance* tinst = DtoIsTemplateInstance(s);