Endless loop in Sema::ArgumentDependentLookup

[Stephan Bergmann]

Looks like trunk r186040 introduced a typo in lib/Sema/SemaLookup.cpp 
that can cause endless loops, fix would apparently be:

> Index: lib/Sema/SemaLookup.cpp
> ===================================================================
> --- lib/Sema/SemaLookup.cpp	(revision 186153)
> +++ lib/Sema/SemaLookup.cpp	(working copy)
> @@ -2758,7 +2758,7 @@
>        // it only if it was declared in an associated classes.
>        if (D->getIdentifierNamespace() == Decl::IDNS_OrdinaryFriend) {
>          bool DeclaredInAssociatedClass = false;
> -        for (Decl *DI = D; DI; DI = D->getPreviousDecl()) {
> +        for (Decl *DI = D; DI; DI = DI->getPreviousDecl()) {
>            DeclContext *LexDC = DI->getLexicalDeclContext();
>            if (AssociatedClasses.count(cast<CXXRecordDecl>(LexDC))) {
>              DeclaredInAssociatedClass = true;

Stephan