Adding a test for checking preprocessor failures in non-direct mode
Adding a test for checking preprocessor failures in non-direct mode

In non-direct mode, failures during the preprocessor call (e.g. when the
given source file does not exist) should not change the statistics in
any way. I first considered whether this could count as a pass-through,
but for now let's document the status quo.

webmaster128/clcache,webmaster128/clcache,webmaster128/clcache