The lowering pattern is currently restricted to integer, float and index types.
This is seemingly arbitrary, as `ub.poison` works for any input type. The lowering should therefore also work with any type that can be converted using the type converter.
This patch therefore simply removes that condition and adds a test ensuring that this works.
Differential Revision: https://reviews.llvm.org/D158982
Also a new pass option `ConvertToLLVMPass` to populate only patterns from the specified dialects. This is needed because the existing test cases expect that only ops from certain dialects are lowered. (E.g., "arith-to-llvm" expects that only "arith" ops are lowered but not "func" ops.)
Differential Revision: https://reviews.llvm.org/D157627
