[turbofan] First version of loop peeling.

src/compiler/control-reducer.cc

Index: src/compiler/control-reducer.cc
diff --git a/src/compiler/control-reducer.cc b/src/compiler/control-reducer.cc
index b17e59dd68361b00a69c49fd9fd49659c9003465..0622cf4017e7f14d81d706acbaabfd3812916905 100644
--- a/src/compiler/control-reducer.cc
+++ b/src/compiler/control-reducer.cc
@@ -456,10 +456,7 @@ class ControlReducerImpl {
     // Gather phis and effect phis to be edited.
     ZoneVector<Node*> phis(zone_);
     for (Node* const use : node->uses()) {
-      if (use->opcode() == IrOpcode::kPhi ||
-          use->opcode() == IrOpcode::kEffectPhi) {
-        phis.push_back(use);
-      }
+      if (IrOpcode::IsPhiOpcode(use->opcode())) phis.push_back(use);
     }
 
     if (live == 1) {