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Switch macOS task mechanism back to ASM (#39679)
5327824 rearranged the ifdefs here and switched macOS to unwind based switching, which is somewhat slower. That was deemed acceptable at the time, because it work around some GDB misbehavior in setjmp. However, we're about to update to the LLVM libunwind fork, which appears to be even slower here, so switch back to ASM to avoid that performance regression.
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