RunClang: Tolerate use of GNU builtin __has_unique_object_representations

The builtin is used by the GNU type_traits header in modes aware of
C++17, so we need to provide it in CastXML.  LLVM/Clang SVN r316518
(implement __has_unique_object_representations, 2017-10-24), in
development of Clang 6, added this GNU builtin.  For older versions of
LLVM/Clang, provide a minimum implementation that at least allows
`type_traits` to parse.

Fixes: #98

1 files changed, 3 insertions, 0 deletions

diff --git a/test/input/has_unique_object_representations.cxx b/test/input/has_unique_object_representations.cxx
new file mode 100644
index 0000000..dd51343
--- /dev/null
+++ b/test/input/has_unique_object_representations.cxx
@@ -0,0 +1,3 @@
+template <bool>
+struct Bool;
+typedef Bool<__has_unique_object_representations(int)> BoolType;