[cfe-commits] [PATCH] Add a new ast-test AST testing mechanism

[John Wiegley]

This patch authored by Eric Niebler.

Creates a new executable during the build called 'ast-test', which parses
code and allows expectations to be stated about particular structures within
the AST.  For example:

  // RUN: %ast_test %s

  int i; // expected-decl-type{{int}}

There are many different AST nodes that be directly tested in this way.  At
present, the full list is in tools/ast-test/main.cpp, in the function
ParseDirective, but proper documentation is to be provided in a subsequent
patch.

We rely on this functionality to guarantee that the AST for particular
features meets a certain requirement, as sometimes the lack or presence
of a diagnostic is not suitably indicative.

John

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