Dear all,

please find in attachment the first patch (of n) for the FAILED IMAGES
capability defined in the coarray TS 18508.
The patch adds support for three new intrinsic functions defined in
the TS for simulating a failure (fail image), checking an image status
(image_status) and getting the list of failed images (failed_images).
The patch has been built and regtested on x86_64-pc-linux-gnu.

Ok for trunk?

Alessandro