[llvm] Reduce llvm-gsymutil memory usage (PR #91023)

[via llvm-commits]

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@@ -629,6 +639,9 @@ Error DwarfTransformer::convert(uint32_t NumThreads, OutputAggregator &Out) {
     }
     pool.wait();
   }
+  // Now get rid of all the DIEs that may have been recreated
+  for (const auto &CU : DICtx.compile_units())
+    CU->clearDIEs(false);
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jeffreytan81 wrote:

Nit: `(/*KeepCUDie=*/false)`

https://github.com/llvm/llvm-project/pull/91023