[turbofan] Fix register constraint for memory barrier.

src/compiler/arm64/instruction-selector-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/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 400 matching lines @@
     // OutOfLineRecordWrite uses the index in an arithmetic instruction, so we
     // must check kArithmeticImm as well as kLoadStoreImm64.
     if (g.CanBeImmediate(index, kArithmeticImm) &&
         g.CanBeImmediate(index, kLoadStoreImm64)) {
       inputs[input_count++] = g.UseImmediate(index);
       addressing_mode = kMode_MRI;
     } else {
       inputs[input_count++] = g.UseUniqueRegister(index);
       addressing_mode = kMode_MRR;
     }
-    inputs[input_count++] = (write_barrier_kind == kMapWriteBarrier)
-                                ? g.UseRegister(value)
-                                : g.UseUniqueRegister(value);
+    inputs[input_count++] = g.UseUniqueRegister(value);
     RecordWriteMode record_write_mode = RecordWriteMode::kValueIsAny;
     switch (write_barrier_kind) {
       case kNoWriteBarrier:
         UNREACHABLE();
         break;
       case kMapWriteBarrier:
         record_write_mode = RecordWriteMode::kValueIsMap;
         break;
       case kPointerWriteBarrier:
         record_write_mode = RecordWriteMode::kValueIsPointer;
@@ skipping 1831 matching lines @@
          MachineOperatorBuilder::kWord32ShiftIsSafe |
          MachineOperatorBuilder::kInt32DivIsSafe |
          MachineOperatorBuilder::kUint32DivIsSafe |
          MachineOperatorBuilder::kWord32ReverseBits |
          MachineOperatorBuilder::kWord64ReverseBits;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8