simplify some code by making the SCCNodes set contain Function*'s

instead of CallGraphNode*'s.  This also papers over a callgraph
problem where a pass (in this case, MemCpyOpt) introduces a new
function into the module (llvm.memset.i64) but doesn't add it to
the call graph (nor should it, since it is a function pass).

While it might be a good idea for MemCpyOpt to not synthesize 
functions in a runOnFunction(), there is no need for FunctionAttrs
to be boneheaded, so fix it there.  This fixes an assertion building
176.gcc.

llvm-svn: 80535

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