[turbofan] Check instruction input/output count limits in instruction selector.

src/compiler/instruction.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_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <iosfwd>
 #include <map>
@@ skipping 929 matching lines @@
   InstructionBlock* block() const { return block_; }
   void set_block(InstructionBlock* block) {
     DCHECK_NOT_NULL(block);
     block_ = block;
   }
 
   // APIs to aid debugging. For general-stream APIs, use operator<<
   void Print(const RegisterConfiguration* config) const;
   void Print() const;
 
+  typedef BitField<size_t, 0, 8> OutputCountField;
+  typedef BitField<size_t, 8, 16> InputCountField;
+  typedef BitField<size_t, 24, 6> TempCountField;
+
+  static const size_t kMaxOutputCount = OutputCountField::kMax;
+  static const size_t kMaxInputCount = InputCountField::kMax;
+  static const size_t kMaxTempCount = TempCountField::kMax;
+
  private:
   explicit Instruction(InstructionCode opcode);
 
   Instruction(InstructionCode opcode, size_t output_count,
               InstructionOperand* outputs, size_t input_count,
               InstructionOperand* inputs, size_t temp_count,
               InstructionOperand* temps);
 
-  typedef BitField<size_t, 0, 8> OutputCountField;
-  typedef BitField<size_t, 8, 16> InputCountField;
-  typedef BitField<size_t, 24, 6> TempCountField;
   typedef BitField<bool, 30, 1> IsCallField;
 
   InstructionCode opcode_;
   uint32_t bit_field_;
   ParallelMove* parallel_moves_[2];
   ReferenceMap* reference_map_;
   InstructionBlock* block_;
   InstructionOperand operands_[1];
 
   DISALLOW_COPY_AND_ASSIGN(Instruction);
@@ skipping 560 matching lines @@
 
 
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_