IPCP cleanups to tree-profiling-branch

[Razya Ladelsky]

Hello,

Attached are several cleanups to ipcp code.

Main changes include:
-  Removing ipa_method and ipa_callsite typedefs, using cgraph_node *  and 
cgraph_edge * instead.
-  Hiding access to aux field of cgraph_node and cgraph_edge by 
IPA_NODE_REF, IPA_EDGE_REF macros.
-  Remove redundant walk_tree, use ADDRESSABLE to check if a parameter's 
address is taken. 
There's also elimination of redundant code and some coding style fixes.

Comments are welcome,
thanks
Razya







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