[llvm] [memprof] Improve deserialization performance in V3 (PR #94787)

[Teresa Johnson via llvm-commits]

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@@ -499,12 +500,56 @@ void CallStackRadixTreeBuilder::build(
 
   // Sort the list of call stacks in the dictionary order to maximize the length
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teresajohnson wrote:

Should this comment be removed?

https://github.com/llvm/llvm-project/pull/94787