Hi,
    this first patch continues with rafactoring of IPA infrastructure so that we will have C++ API. In the patch, I transformed many global functions to members of symtab_node and cgraph_node.

Example:
cgraph_remove_node (struct cgraph_node *node) -> cgraph_node::remove (void)
symtab_unregister_node (symtab_node *node) -> symtab_node::unregister (void)

The patch is being consulted with Honza and will iterate. We want to inform folk that we plan to do following changes.

After the patch is applied, I would like to transform varpool_node and cgraph_edge in the following patch.

Thank you for your comments,
Martin