[llvm] [memprof] Use CSId to construct MemProfRecord (PR #88362)

[Snehasish Kumar via llvm-commits]

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@@ -392,6 +394,10 @@ struct IndexedMemProfRecord {
                                           const unsigned char *Buffer,
                                           IndexedVersion Version);
 
+  MemProfRecord toMemProfRecord(
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snehasish wrote:

Can you add a comment to document the callback parameter?

https://github.com/llvm/llvm-project/pull/88362