Fix DU-chain memory management using arena alloc #228
Merged
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This commit migrates definition-use (DU) chain allocation from manual memory management to the arena allocator system. This change ensures consistent memory handling and prevents potential memory leaks.
The DU-chain memory is now automatically freed when INSN_ARENA is destroyed during global_release(), following shecc's established memory management patterns.
Close #160
Summary by Bito
This pull request improves memory management by replacing manual allocation with an arena allocator system, enhancing consistency and reducing memory leak risks. The DU-chain memory will be automatically released upon destruction of the INSN_ARENA, following best practices.