[turbofan] Match selects in control reducer (configurable).

src/compiler/control-reducer.h

Index: src/compiler/control-reducer.h
diff --git a/src/compiler/control-reducer.h b/src/compiler/control-reducer.h
index bcbd80e9165c6fefea45f531693101ed7ac49ada..1e29e01e85a68d29f02c1992ef9b8a9a1d5a8b6f 100644
--- a/src/compiler/control-reducer.h
+++ b/src/compiler/control-reducer.h
@@ -23,14 +23,15 @@ class ControlReducer {
  public:
   // Perform branch folding and dead code elimination on the graph.
   static void ReduceGraph(Zone* zone, JSGraph* graph,
-                          CommonOperatorBuilder* builder);
+                          CommonOperatorBuilder* builder,
+                          int max_phis_for_select = 0);
 
   // Trim nodes in the graph that are not reachable from end.
   static void TrimGraph(Zone* zone, JSGraph* graph);
 
   // Reduces a single merge node and attached phis.
   static Node* ReduceMerge(JSGraph* graph, CommonOperatorBuilder* builder,
-                           Node* node);
+                           Node* node, int max_phis_for_select = 0);
 
   // Testing interface.
   static Node* ReducePhiForTesting(JSGraph* graph,