This one is useful for inspecting the completions we get from clang
(e.g. for checking if the bug is in clang or in our code, or to compare
the completions of different clang versions).

Change-Id: If9dfe1b58a2b087ef6b92485e10ff272badf75c8
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>