[PATCH] D20382: Add postorder support to RecursiveASTVisitor

[Raphael Isemann via cfe-commits]

teemperor added a comment.

The motivation for this patch is a hashing algorithm for all AST nodes
which reuses child hash values to be O(n) and therefore needs postorder support
(think Java's Object.hashCode() but on AST nodes as an example).

The full code that currently uses this feature can be seen here:
https://github.com/Teemperor/clang/commit/9fdb10a8a910968a795cdd48e1271fe2140fcd2f


http://reviews.llvm.org/D20382