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A task class that declares bodies for several device types leaves the choice of device to the runtime, and a caller had no way to narrow it. The PTG compiler had the same need for the device types a build does not support, and open-coded its own compaction of the incarnation arrays to get it. parsec_taskpool_trim_chores() takes a specification such as "potrf:cuda;trsm:cuda,hip", where "*" stands for every task class and "gpu" for every accelerator type, and removes those incarnations before anything looks at them. The result is a taskpool that reads like one whose tasks never declared those bodies, instead of one that offers them and turns them down a task at a time. A task class named by the specification but absent from the taskpool is reported and not an error, so one specification can be handed to several taskpools; emptying a task class is refused, as it would leave tasks that can never run. parsec_taskpool_drop_chores() does the removal from a device type mask and is what jdf2c now emits in place of its loop. It is backed by parsec_device_type_from_name(), which maps a device type name to its mask, and parsec_task_class_device_types(), which reports the types a task class has an incarnation for.
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Lets a caller drop incarnations from a taskpool by device type or by body name, so a DSL can decide at runtime that a kernel is not to be used. Adds
tests/api/trim_choresfor coverage.Draft: another API is still to be added here.
Stacked on #811, whose single commit shows up here until it merges.