[OpenMP][Clang] Parsing/Sema support for use_device_ptr(fb_preserve/fb_nullify).
#170578
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…fb_nullify)`. Depends on #169603. This is the `use_device_ptr` counterpart of #168905. With OpenMP 6.1, a `fallback` modifier can be specified on the `use_device_ptr` clause to control the behavior when a pointer lookup fails, i.e. there is no device pointer to translate into. The default is `fb_preserve` (i.e. retain the original pointer), while `fb_nullify` means: use `nullptr` as the translated pointer.
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Depends on #169603.
This is the
use_device_ptrcounterpart of #168905.With OpenMP 6.1, a
fallbackmodifier can be specified on theuse_device_ptrclause to control the behavior when a pointer lookupfails, i.e. there is no device pointer to translate into.
The default is
fb_preserve(i.e. retain the original pointer), whilefb_nullifymeans: usenullptras the translated pointer.