Unprotect and protect code memory during GC #134
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MMTk replaced FragmentedMapper with TwoLevelMmapper. It will make the is_mmtk_object assertion on write barriers much cheaper.
We unprotect code memory in Prepare and protect it again in VMRefClosure so that during copying GC we can update references embedded in JIT-compiled code when using YJIT.
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We unprotect code memory in Prepare and protect it again in VMRefClosure so that during copying GC we can update references embedded in JIT-compiled code when using YJIT.