[turbofan] Optimize certain chains of Branch into a Switch.

src/compiler/operator.cc

 // 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.
 
 #include "src/compiler/operator.h"
 
 #include <limits>
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 namespace {
 
 template <typename N>
 V8_INLINE N CheckRange(size_t val) {
   CHECK_LE(val, std::numeric_limits<N>::max());
   return static_cast<N>(val);
 }
 
 }  // namespace
 
 
+// static
+STATIC_CONST_MEMBER_DEFINITION const size_t Operator::kMaxControlOutputCount;
+
+
 Operator::Operator(Opcode opcode, Properties properties, const char* mnemonic,
                    size_t value_in, size_t effect_in, size_t control_in,
                    size_t value_out, size_t effect_out, size_t control_out)
     : opcode_(opcode),
       properties_(properties),
       mnemonic_(mnemonic),
       value_in_(CheckRange<uint32_t>(value_in)),
       effect_in_(CheckRange<uint16_t>(effect_in)),
       control_in_(CheckRange<uint16_t>(control_in)),
       value_out_(CheckRange<uint16_t>(value_out)),
       effect_out_(CheckRange<uint8_t>(effect_out)),
-      control_out_(CheckRange<uint8_t>(control_out)) {}
+      control_out_(CheckRange<uint16_t>(control_out)) {}
 
 
 std::ostream& operator<<(std::ostream& os, const Operator& op) {
   op.PrintTo(os);
   return os;
 }
 
 
 void Operator::PrintTo(std::ostream& os) const { os << mnemonic(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8