[llvm] [X86] Fix MachineBlockInfo hash for machine-block-hash.mir (PR #201039)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

Where exactly is this failing and why?

I thought half the point of this test was to ensure that this hash is stable across platforms.

https://github.com/llvm/llvm-project/pull/201039