d7e84cbb0f
This makes the structure of the vec4 live intervals calculation more similar to the FS back-end liveness analysis code. The non-CF-aware start/end computation is moved into the same pass that calculates the block-local def/use sets, which saves quite a bit of code, while the CF-aware start/end computation is moved into a separate compute_start_end() function as is done in the FS back-end. Reviewed-by: Matt Turner <mattst88@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4012>