Reduce register pressure on ARM, ARM64, and MIPS.

runtime/vm/constants_arm64.h

 // Copyright (c) 2014, 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 VM_CONSTANTS_ARM64_H_
 #define VM_CONSTANTS_ARM64_H_
 
 #include "platform/assert.h"
 
 namespace dart {
@@ skipping 399 matching lines @@
   ADD = AddSubShiftExtFixed,
   SUB = AddSubShiftExtFixed | B30,
 };
 
 // C3.5.6
 enum ConditionalSelectOp {
   ConditionalSelectMask = 0x1fe00000,
   ConditionalSelectFixed = DPRegisterFixed | B28 | B23,
   CSEL = ConditionalSelectFixed,
   CSINC = ConditionalSelectFixed | B10,
+  CSINV = ConditionalSelectFixed | B30,
 };
 
 // C3.5.8
 enum MiscDP2SourceOp {
   MiscDP2SourceMask = 0x5fe00000,
   MiscDP2SourceFixed = DPRegisterFixed | B28 | B23 | B22,
   UDIV = MiscDP2SourceFixed | B11,
   SDIV = MiscDP2SourceFixed | B11 | B10,
   LSLV = MiscDP2SourceFixed | B13,
   LSRV = MiscDP2SourceFixed | B13 | B10,
@@ skipping 585 matching lines @@
   static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
 };
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_ARM64_H_