[llvm] [llvm] add vt_gen target as a dependency of llvm/lib/Analysis (PR #120661)

[NAKAMURA Takumi via llvm-commits]

https://github.com/chapuni requested changes to this pull request.

`LLVMAnalysis` doesn't depend on vt_gen. It's too early.

I revisited #120502. Is `MachinePassBuilder.h` really required in `DroppedVariableStats.h`?

https://github.com/llvm/llvm-project/pull/120661