fix regressions affecting the echo magic and the creating of rod files

the markAndSweep GC was not responsible for the regressions so
this commit restores its use

compiler/nimrod.cfg

@@ -2,7 +2,7 @@
 
 mainModule:"nimrod.nim"
 
-# gc:markAndSweep
+gc:markAndSweep
 
 hint[XDeclaredButNotUsed]:off
 path:"llvm"

compiler/semexprs.nim

@@ -686,7 +686,7 @@ proc semIndirectOp(c: PContext, n: PNode, flags: TExprFlags): PNode =
       result = n.sons[0]
       result.kind = nkCall
       for i in countup(1, sonsLen(n) - 1): addSon(result, n.sons[i])
-      return semDirectOp(c, result, flags)
+      return semExpr(c, result, flags)
   else: 
     n.sons[0] = semExpr(c, n.sons[0])
   let nOrig = n.copyTree

compiler/semtypes.nim

@@ -608,7 +608,9 @@ proc liftParamType(c: PContext, procKind: TSymKind, genericParams: PNode,
       if genericParams.sons[i].sym.name.id == finalTypId.id:
         return genericParams.sons[i].typ
 
-    var s = newSym(skType, finalTypId, typeClass.sym, info)
+    let owner = if typeClass.sym != nil: typeClass.sym
+                else: getCurrOwner()
+    var s = newSym(skType, finalTypId, owner, info)
     if typId == nil: s.flags.incl(sfAnon)
     s.linkTo(typeClass)
     s.position = genericParams.len