[llvm] [StableHash] Implement stable global name for the hash computation (PR #106156)

[Kyungwoo Lee via llvm-commits]

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@@ -50,6 +50,22 @@ inline stable_hash stable_hash_combine(stable_hash A, stable_hash B,
   return stable_hash_combine(Hashes);
 }
 
+// Removes suffixes introduced by LLVM from the name to enhance stability and
+// maintain closeness to the original name across different builds.
+inline StringRef get_stable_name(StringRef Name) {
+  auto [P1, S1] = Name.rsplit(".llvm.");
+  auto [P2, S2] = P1.rsplit(".__uniq.");
+  return P2;
+}
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kyulee-com wrote:

Yes, the code segments appear similar, but they could be implied slightly differently depending on the client. Specifically, in this instance, I am planning to further extend the functionality for the upcoming global outlining feature -- https://github.com/llvm/llvm-project/pull/90074. I intend to introduce an additional suffix `.content.{number}` to the outlined function names, which will enable us to deduce the identities of target functions even when their names vary -- in that case, use the content hash from the suffix, rather than ignoring it . So, I think the usage here is primarily focused on accurately identifying the stable target based on the name.

https://github.com/llvm/llvm-project/pull/106156