Revert of [turbofan] Run DeadCodeElimination together with the advanced reducers.

src/compiler/verifier.cc

Index: src/compiler/verifier.cc
diff --git a/src/compiler/verifier.cc b/src/compiler/verifier.cc
index 3cc1e85c0a97489a7d06a13bb1edc0bd22efe43d..e678f4e6a5e955e31bf12586e20b0de067c04069 100644
--- a/src/compiler/verifier.cc
+++ b/src/compiler/verifier.cc
@@ -194,7 +194,10 @@
       break;
     case IrOpcode::kDead:
       // Dead is never connected to the graph.
-      UNREACHABLE();
+      // TODO(mstarzinger): Make the GraphReducer immediately perform control
+      // reduction in case control is killed. This will prevent {Dead} from
+      // being reachable after a phase finished. Then re-enable below assert.
+      // UNREACHABLE();
       break;
     case IrOpcode::kBranch: {
       // Branch uses are IfTrue and IfFalse.