[ARM64] [turbofan] Use 'mvn' rather than an equivalent 'orn'.

src/compiler/arm64/code-generator-arm64.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/code-generator.h"
 
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 540 matching lines @@
       break;
     }
     case kArm64Umod32: {
       UseScratchRegisterScope scope(masm());
       Register temp = scope.AcquireW();
       __ Udiv(temp, i.InputRegister32(0), i.InputRegister32(1));
       __ Msub(i.OutputRegister32(), temp, i.InputRegister32(1),
               i.InputRegister32(0));
       break;
     }
-    // TODO(dcarney): use mvn instr??
     case kArm64Not:
-      __ Orn(i.OutputRegister(), xzr, i.InputOperand(0));
+      __ Mvn(i.OutputRegister(), i.InputOperand(0));
       break;
     case kArm64Not32:
-      __ Orn(i.OutputRegister32(), wzr, i.InputOperand32(0));
+      __ Mvn(i.OutputRegister32(), i.InputOperand32(0));
       break;
     case kArm64Neg:
       __ Neg(i.OutputRegister(), i.InputOperand(0));
       break;
     case kArm64Neg32:
       __ Neg(i.OutputRegister32(), i.InputOperand32(0));
       break;
     case kArm64Or:
       __ Orr(i.OutputRegister(), i.InputRegister(0), i.InputOperand2_64(1));
       break;
@@ skipping 746 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8