[turbofan] Fix register constraint for memory barrier.

src/compiler/arm/instruction-selector-arm.cc

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 795529d8a3520a41a0df9a2e84ba89c62e2f2dc3..a5388c5f49256484c6b297771e144cd0dd3f5c09 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -374,9 +374,7 @@ void InstructionSelector::VisitStore(Node* node) {
       inputs[input_count++] = g.UseUniqueRegister(index);
       addressing_mode = kMode_Offset_RR;
     }
-    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: