removing unused NoOpHeuristic (#3670)

1. Removing unused NoOpHeuristic;
2. Moving computation of scheduler/launch params into the block when
it's needed.

benchmarks/cpp/utils.cpp

@@ -190,14 +190,14 @@ int64_t runBenchmarkIterations(
               ->groups()
               .size() > 1;
 
-  const auto& compile_log = executor_cache->getMostRecentExecutorInfo();
-  auto params = toString(compile_log.params);
-  auto lparams = toString(
-      compile_log.fusion_executor->as<KernelExecutor>()->lastLaunchParams());
   // Only set if not segmented. In the case of segmented fusions,
   // this could be confusing as the log would refect only the last
   // segment. Revisit if necessary.
   if (!segmented) {
+    const auto& compile_log = executor_cache->getMostRecentExecutorInfo();
+    auto params = toString(compile_log.params);
+    auto lparams = toString(
+        compile_log.fusion_executor->as<KernelExecutor>()->lastLaunchParams());
     benchmark_state.SetLabel(params + lparams);
   }
 

csrc/scheduler/no_op.h

@@ -45,24 +45,4 @@ class NoOpScheduler : public SchedulerEntry {
   }
 };
 
-//! Provides a dummy heuristic type to ensure
-//!  unified interface on NoOp scheduler.
-class NoOpHeuristic : public HeuristicParams {
- public:
-  using HeuristicParams::HeuristicParams;
-  NoOpHeuristic() : HeuristicParams(SchedulerType::NoOp) {};
-
-  size_t hash() const override {
-    return 0;
-  }
-  std::unique_ptr<HeuristicParams> clone() const override {
-    return std::make_unique<NoOpHeuristic>(*this);
-  }
-
-  bool sameAs(const HeuristicParams* other) const override {
-    auto other_casted = dynamic_cast<const NoOpHeuristic*>(other);
-    return other_casted != nullptr && other_casted->cparams == cparams;
-  };
-};
-
 } // namespace nvfuser