scottconstable wrote:

> If you are changing the hash scheme, please migrate from xxHash64 to xxh3. We 
> want to remove the legacy xxHash64 from LLVM.

It seems from the discussion above that this change would require a new flag. 
Suppose, for instance, that a user builds a kernel with a version of Clang that 
uses xxh3, and a version of rustc that still uses xxHash64. Then the hashes 
could be incompatible and the kernel will crash.

This PR is specific to X86-64 targets. Your suggestion seems like a general 
enhancement that should apply to all targets; I think it should be a separate 
PR.

https://github.com/llvm/llvm-project/pull/117121
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