nir/algebraic: optimize bits=umin(bits, 32-(offset&0x1f))

Optimizes patterns which are created by recent versions of vkd3d-proton, when constant folding doesn't eliminate it entirely:

• ubitfield_extract(value, offset, umin(bits, 32-(offset&0x1f)))
• ibitfield_extract(value, offset, umin(bits, 32-(offset&0x1f)))
• bitfield_insert(base, insert, offset, umin(bits, 32-(offset&0x1f)))

vkd3d-proton commits:

• https://github.com/HansKristian-Work/vkd3d-proton/commit/0f802b151ec4445bae18ec87ec82fed4c33f3120
• https://github.com/HansKristian-Work/dxil-spirv/commit/5e134f45ef3e3f332383e0b1260487e1659cd3a1