[llvm] Modify llvm-gsymutil lookups to handle overlapping ranges correctly. (PR #72350)

[Alexander Yermolovich via llvm-commits]

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@@ -266,6 +266,18 @@ class GsymReader {
       return std::nullopt;
     if (Iter == End || AddrOffset < *Iter)
       --Iter;
+
+    // GSYM files store the richest information first in the file, so always
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ayermolo wrote:

What do you mean by richest?

https://github.com/llvm/llvm-project/pull/72350