34a08cb89c
This patch removes spurious includes of `llvm/IR` files, and unnecessary link components in the LLVM dialect. The only major dependencies still coming from LLVM are `llvm::DataLayout`, which is used by `verifyDataLayoutString` and some `dwarf` symbols in some attributes. Both of them should likely be removed in the future. Finally, I also removed one constructor from `LLVM::AssumeOp` that used [OperandBundleDefT](https://llvm.org/doxygen/classllvm_1_1OperandBundleDefT.html) without good reason and introduced a header unnecessarily.