In 87839680c0, a very subtle mistake was made with the CFG walking
recursion. Instead of setting the local has_nested_loop variable when
process child loops, has_nested_loop_out was passed directly into the
process_loop_in_block call. This broke nested loop detection heuristics
and caused loop unrolling to run massively out of control. In
particular, it makes the following CTS test compile virtually forever:
dEQP-VK.spirv_assembly.instruction.graphics.16bit_storage.struct_mixed_types.uniform_buffer_block_geom
Fixes: 87839680c0 "nir: Fix breakage of foreach_list_typed_safe..."
Closes: #2710
Reviewed-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4380>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4380>
b113170559