This patch changes the libomptarget runtime to always emit debug messages that occur before offloading failure. The goal is to provide users with information about why their application failed in the target region rather than a single failure message. This is only done in regions that precede offloading failure so this should not impact runtime performance. if the debug environment variable is set then the message is forwarded to the debug output as usual.
A new environment variable was added for future use but does nothing in this current patch. LIBOMPTARGET_INFO will be used to report runtime information to the user if requrested, such as grid size, SPMD usage, or data mapping. It will take an integer indicating the level of information verbosity and a value of 0 will disable it.