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

[via llvm-commits]

h-vetinari wrote:

> `LLVMAnalysis` doesn't depend on vt_gen.

Currently, it does.

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

Sorry, no idea about this, I'm just trying to fix a build failure because any TU that ends up including `MachineValueType.h` must depend on `vt_gen` (or risk running into build failures with missing header files due to missing build graph enforcement, c.f. #107687).

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