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

src/compiler/node-matchers.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_NODE_MATCHERS_H_
 #define V8_COMPILER_NODE_MATCHERS_H_
 
 #include <cmath>
 
 // TODO(turbofan): Move ExternalReference out of assembler.h
@@ skipping 552 matching lines @@
   bool Matched() const { return branch_; }
   bool IfProjectionsAreOwned() const {
     return if_true_->OwnedBy(node()) && if_false_->OwnedBy(node());
   }
 
   Node* Branch() const { return branch_; }
   Node* IfTrue() const { return if_true_; }
   Node* IfFalse() const { return if_false_; }
   Node* Merge() const { return node(); }
 
+  Node* TrueInputOf(Node* phi) const {
+    DCHECK(IrOpcode::IsPhiOpcode(phi->opcode()));
+    DCHECK_EQ(3, phi->InputCount());
+    DCHECK_EQ(Merge(), phi->InputAt(2));
+    return phi->InputAt(if_true_ == Merge()->InputAt(0) ? 0 : 1);
+  }
+
+  Node* FalseInputOf(Node* phi) const {
+    DCHECK(IrOpcode::IsPhiOpcode(phi->opcode()));
+    DCHECK_EQ(3, phi->InputCount());
+    DCHECK_EQ(Merge(), phi->InputAt(2));
+    return phi->InputAt(if_true_ == Merge()->InputAt(0) ? 1 : 0);
+  }
+
  private:
   Node* branch_;
   Node* if_true_;
   Node* if_false_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_NODE_MATCHERS_H_