[llvm] [Support][BLAKE3] Prefix more blake3 methods (PR #149007)

[Jordan Rupprecht via llvm-commits]

rupprecht wrote:

Yes, this seems like something that's difficult to test. I verified it fixed some targets, but will add another PR if I discover something else.

Thanks for the merge & cherry pick, @nikic

https://github.com/llvm/llvm-project/pull/149007