[llvm] Reduce llvm-gsymutil memory usage (lambda-free, and less locking) (PR #97640)

[Kevin Frei via llvm-commits]

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@@ -653,6 +659,10 @@ bool DWARFUnit::parseDWO(StringRef DWOAlternativeLocation) {
 }
 
 void DWARFUnit::clearDIEs(bool KeepCUDie) {
+  // We need to acquire the FreeDIEsMutex lock in write-mode, because we are
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kevinfrei wrote:

Oops: That slipped through. I'll update it.

https://github.com/llvm/llvm-project/pull/97640