[llvm] [Fuzzer] llvm-isel-fuzzer: Add support for additional mutation strategies (PR #223327)

[Afonso Bordado via llvm-commits]

afonso360 wrote:

> Have you run the enhanced fuzzer for longer? Any new bugs found?

For around ~24h, but not on very fast machines. It did find https://github.com/llvm/llvm-project/issues/223282 for x86.

I have not yet ran it on any other arch. But if there is interest, I can run it for another one.

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Will take a look at why CI is failing later today.

https://github.com/llvm/llvm-project/pull/223327