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SMC: Finer grained Mman / Invalidation Locks
Follow up from #1842,
We can use much finer grained mman / translation locks, vs the lock the world approach taken there.
- Use an inverval lock tree
- Lock based on arguments (eg, mmap w/o MAP_FIXED doesn't need to clear code caches, or mprotect that doesn't affect PROT_EXEC, etc)
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