[cfe-dev] C++ new expression

[Sebastian Redl]

OK, here's my patch for initial parsing, AST and Sema support. There's 
still some shortcomings, but I'd like to check it in as is, and enhance 
it later.

Shortcomings:
1) Doesn't parse ::new and ::delete
2) Doesn't correctly handle new (type[10]), because the expression is lost.
3) AST printing is incomplete.
4) Doesn't look for an appropriate operator new overload.
5) Doesn't look for an appropriate constructor.

In other words, the sema is very incomplete.

Doug, I could use some help with the overloading.

Sebastian
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