[llvm] [MC][NFC] Allow MCInstrAnalysis to store state (PR #65479)

[Job Noorman via llvm-commits]

mtvec wrote:

> The code formatter check seems to have failed. Might need to run clang-format?

I'm not entirely sure why they're failing but it seems to be some intermittent error, unrelated to formatting, that I see happening every now and then on GH:

```
Error: Unable to determine a difference between 53179129edbff13644b7c46336773fb8740899c9..2eac9f59aca1c59d47a615084b2bfb839e9f1b0c
```

> No objections from me - the solution seems reasonably neat. Please give it a few more days to let @MaskRay chime in as he has a better understanding of the MC disassembly stuff than I do and he was away recently, so might still be catching up.

Sounds good!

https://github.com/llvm/llvm-project/pull/65479