Ignore the files emitted by the --dump-preprocessed-input flag

fitzgen · fitzgen · commit d910f34d78ce · 2017-07-13T14:19:52.000-07:00
diff --git a/.gitignore b/.gitignore
@@ -8,3 +8,6 @@ tests/expectations/Cargo.lock
 # Test script output
 ir.dot
 ir.png
+
+# Output of the --dump-preprocessed-input flag.
+__bindgen.*
