[llvm] [Kaleidoscope] Switch to the new PassManager. (PR #69032)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

grepping `getResult()` in instcombine perhaps we're missing
```
  FAM.registerPass([&] { return ModuleAnalysisManagerFunctionProxy(MAM); });
```

https://github.com/llvm/llvm-project/pull/69032