bac9148a09
The backtracking allocator also adds registers for at-start uses to safepoints, so change the verifier to check these uses too. Also remove the early return for `THIS_FRAME_ARGSLOT` allocations in `checkSafepointAllocation`. It's not clear why that's there so it's safer to check these allocations too. Differential Revision: https://phabricator.services.mozilla.com/D246445
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