[cfe-dev] Semantic tree transformations

[Douglas Gregor]

I've just committed the start of a semantic AST transformation, which  
is intended to be the basis for template instantiation, expression  
cloning, and any other tree transformations. At the moment, it's being  
used for template instantiation of types. The actual commit is here:

	http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20090803/019982.html

Comments welcome!

	- Doug