link/macho: fix perf bug in DWARF parsing #20062
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After this fix we are back on track to start working on further optimisations in the future: 
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Fixes a perf bug reported downstream kubkon/bold#138
After the fix, for the test case described in the issue, memory RSS drops back down from 16GB to a reasonable 2.4GB, and time it takes to link the program is reduced ~4x as shown below: