[PATCH] Minor Attr.td tablegen additions

[Aaron Ballman]

There are type attributes and target-specific attributes which get
somewhat special semantic handling.  By codifying this as part of the
tablegen file, we can generate more specific code in the future as
well as more cleanly express intent in the tablegen.

This patch is laying some groundwork for eventually removing much of
the redundancy from SemaDeclAttr.cpp.  More patches on that are
coming.  In and of itself, this patch removes some code from Attr.td
(namely ASTNode = 0 declarations on various type attributes), and
fixes a mistake with Ptr32, Ptr64, UPtr and SPtr generating AST nodes
that are never actually used anywhere.

Note that this patch does not add a TypeAttr base class like it does
for InheritableAttr (et al) -- there are no type attributes which
generate AST nodes currently (this is the same reason there is no
TYPE_ATTR macro).

~Aaron
-------------- next part --------------
A non-text attachment was scrubbed...
Name: attr.patch
Type: application/octet-stream
Size: 5296 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20130717/068d16b7/attachment.obj>