In IR2OC constructor, widenconst OC argtypes (#46108)
* In IR2OC constructor, widenconst OC argtypes
The IR argtypes are lattice elements, but OC needs types.
* Update base/compiler/ssair/legacy.jl
Co-authored-by: Shuhei Kadowaki <40514306+aviatesk@users.noreply.github.com>
Co-authored-by: Shuhei Kadowaki <40514306+aviatesk@users.noreply.github.com>
