nir/spirv: Translate SPIR-V to NIR for new INTEL_shader_integer_functions2 opcodes

nir/spirv: Translate SPIR-V to NIR for new INTEL_shader_integer_functions2 opcodes

v2: Rebase on 272e927d0e9 ("nir/spirv: initial handling of OpenCL.std
extension opcodes")

v3: Add missing SpvOpUCountTrailingZerosINTEL case to switch in
vtn_handle_body_instruction. Remove stray semicolon in
vtn_nir_alu_op_for_spirv_opcode. Use umin instead of umax for
SpvOpUCountTrailingZerosINTEL "lowering" in vtn_handle_alu.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/767>