[plugins-ici-cloning-instrumentation] new GCC plugin developements

[Joern Rennecke]

We got a name clash.
In gcc 4.5, passes.c:register_pass is used to register a pass in a
specific place in the pass tree.
In gcc-4.4.0-ici, pass-manager.c:register_pass is used to register a  
pass by name.