[OpenMP] Use ext linkage for kernels handles and globals handles keep… (#200964) … linkage Host handles are now emmitted with external linkage to clash if two kernels with the same name are registered. This could have happen right now and silently corrupt the program, but it can happen more easily once we allow users to name their kernels. In the same patch we make global variable handles retain the linkage of the global variable, forcing clashes for external ones and continue to support weak use cases. --------- Co-authored-by: Shilei Tian <i@tianshilei.me>
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