[llvm] [StructuralHash] Refactor (PR #112621)

[Aiden Grossman via llvm-commits]

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@@ -14,14 +14,15 @@
 #ifndef LLVM_IR_STRUCTURALHASH_H
 #define LLVM_IR_STRUCTURALHASH_H
 
+#include "llvm/ADT/StableHashing.h"
 #include <cstdint>
 
 namespace llvm {
 
 class Function;
 class Module;
 
-using IRHash = uint64_t;
+using IRHash = stable_hash;
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boomanaiden154 wrote:

If we're just going to use `stable_hash`, should we get rid of the `IRHash` name here?

We either need to do this or use `IRHash` instead of `stable_hash` in a couple instances in the implementation.

https://github.com/llvm/llvm-project/pull/112621