Free thread stacks securely#676
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this used to be a `clang::CodeGenerator *`, but is now a std::unique_ptr<clang::CodeGenerator>
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the old unified storage of initial thread stacks could not be protected per-compartment, so we switch to a scheme similar to ia2_stackptr_N
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The AArch64 version of the inline asm changes here is still a probably-incorrect sketch, but this should work for x86_64.