[cfe-dev] Review Request: Plain Old Data (POD) property of classes, and type traits basics

[Sebastian Redl]

Hi,

I've implemented the POD property of classes, and (in order to test it)
a basic infrastructure for GCC's type traits extensions, plus a concrete
implementation of the __is_pod trait.

However, I'm not quite sure about all aspects of the patch, so I'm
posting it for review first. In particular, I have an enum called
UnaryTypeTrait that represents the various type trait keywords. Since it
is needed in the parser, the sema and the AST, I saw no other choice but
to make it part of Basic. Is this the right thing to do?

Patch is attached.

Sebastian
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