Johan,
If you suspect the bug is in an AMD driver, information about how to report them is on the home page of the forum. "If you have a reproducible case, you can file a defect report at www.amd.com/report."
If you think the bug is in an AMD compiler or tool, you can report them here in the appropriate forum. I will make sure the report is seen. I can't guarantee how it will be prioritized, obviously.