offload: move (un)register lib into global_ctors #150893
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@kevinsala #150683 fails with the commit where I drop
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I dropped the last commit, since we'll still need |
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Right now we initialize the omp/offload runtime before every single offload call, and tear it down directly afterwards.
What we should rather do is initialize it once in the binary startup code, and tear it down at the end of the binary execution. Here I implement these changes.
Together, our generated IR has a lot less usage of globals, which in turn simplifies the refactoring in #150683, where I introduce a new variant of our offload intrinsic.
r? oli-obk