PATCH RFA: Move tree codes used only by C++ frontend into cp/*

[Gabriel Dos Reis]

Paolo Bonzini <paolo.bonzini@lu.unisi.ch> writes:

| > A meta question:  Have we agreed that it is a wrong idea to unify the
| > C and C++ front-ends, therefore either front-end is better developed
| > independently?
| 
| This patch, however, does not imply that.

The reason I ask is very simple: If we did, then it makes perfect
sense to me.  If not, I don't see the value of the patch.

| Put these tree codes only
| in cp/* tracks that removing them is a necessary part of unifying the
| two front-ends.

Sorry, I do not understand.

-- Gaby