[cfe-commits] [PATCH] Implement C++11 alias templates

[Richard Smith]

Hi,

The attached patch implements C++11 alias templates.

I've added a new Decl node for alias templates: TypeAliasTemplateDecl.
Alias template specialization types also need to track the
non-canonicalized aliased type, so I've extended
TemplateSpecializationType to store a non-canonical QualType in the case
where it refers to an alias template.

I hit into a couple of issues with the FDIS while implementing this:

 * There is no obvious restriction that a redeclaration of an alias
template must use an equivalent type.
 * [temp.alias]p3 describes two situations which I believe are impossible
now that the point of declaration of an alias template has been moved to
the semicolon.

Please review!

Thanks,
Richard
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