Argument-dependent lookup for friend declarations. Add a new decl type,

FriendFunctionDecl, and create instances as appropriate.

The design of FriendFunctionDecl is still somewhat up in the air;  you can
befriend arbitrary types of functions --- methods, constructors, etc. ---
and it's not clear that this representation captures that very well.
We'll have a better picture when we start consuming this data in access
control.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@78653 91177308-0d34-0410-b5e6-96231b3b80d8

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