nir: add an instruction set API
This will replace direct usage of nir_instrs_equal() in the CSE pass, which reduces an O(n^2) algorithm with an effectively O(n) one. It'll also be useful for implementing GVN on top of GCM. v2: - Add texture support. - Add more comments. - Rename instr_can_hash() to instr_can_rewrite() since it's really more about whether its uses can be rewritten, and it's implicitly used by nir_instrs_equal() as well. - Rename nir_instr_set_add() to nir_instr_set_add_or_rewrite() (Jason). - Make the HASH() macro less magical (Topi). - Rewrite the commit message. v3: - For sorting phi sources, use a VLA, store pointers to the sources, and compare the predecessor pointer directly (Jason). Reviewed-by:Jason Ekstrand <jason.ekstrand@intel.com> Signed-off-by:
Connor Abbott <cwabbott0@gmail.com>