VM-codegen: Clean up the way we emit code for comparison instructions.

runtime/vm/constants_arm.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_CONSTANTS_ARM_H_
 #define RUNTIME_VM_CONSTANTS_ARM_H_
 
 #include "platform/globals.h"
 #include "platform/assert.h"
 
@@ skipping 336 matching lines @@
   VS = 6,                  // overflow
   VC = 7,                  // no overflow
   HI = 8,                  // unsigned higher
   LS = 9,                  // unsigned lower or same
   GE = 10,                 // signed greater than or equal
   LT = 11,                 // signed less than
   GT = 12,                 // signed greater than
   LE = 13,                 // signed less than or equal
   AL = 14,                 // always (unconditional)
   kSpecialCondition = 15,  // special condition (refer to section A3.2.1)
-  kMaxCondition = 16,
+  kNumberOfConditions = 16,
+  kInvalidCondition = 16
 };
 
 
 // Opcodes for Data-processing instructions (instructions with a type 0 and 1)
 // as defined in section A3.4
 enum Opcode {
   kNoOperand = -1,
   AND = 0,   // Logical AND
   EOR = 1,   // Logical Exclusive OR
   SUB = 2,   // Subtract
@@ skipping 389 matching lines @@
   static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_CONSTANTS_ARM_H_