Add sparse conditional copy propagation to Triton's make_ttgir transformation pipeline. (#4694)

The SCCP pass is a dataflow transformation that propagates constants
through the IR, therefore simplifying it.

Signed-off-by: Tiotto, Ettore <[email protected]>

Author: etiotto

third_party/intel/backend/compiler.py

@@ -304,6 +304,7 @@ def make_ttgir(mod, metadata, opt, properties):
         passes.ttgpuir.add_reorder_instructions(pm)
         passes.common.add_cse(pm)
         passes.common.add_symbol_dce(pm)
+        passes.common.add_sccp(pm)
         passes.common.add_canonicalizer(pm)
         if knobs.intel.opt_reduction_locality:
             intel.passes.ttgpuir.add_optimize_reduction_locality(pm)