Move register conventions out of the IC classes.

src/ic/arm64/ic-conventions-arm64.cc

+// Copyright 2013 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/v8.h"
+
+#if V8_TARGET_ARCH_ARM64
+
+#include "src/codegen.h"
+#include "src/ic/ic-conventions.h"
+
+namespace v8 {
+namespace internal {
+
+// IC register specifications
+const Register LoadConvention::ReceiverRegister() { return x1; }
+const Register LoadConvention::NameRegister() { return x2; }
+
+const Register VectorLoadConvention::SlotRegister() {
+  DCHECK(FLAG_vector_ics);
+  return x0;
+}
+
+
+const Register FullVectorLoadConvention::VectorRegister() {
+  DCHECK(FLAG_vector_ics);
+  return x3;
+}
+
+
+const Register StoreConvention::ReceiverRegister() { return x1; }
+const Register StoreConvention::NameRegister() { return x2; }
+const Register StoreConvention::ValueRegister() { return x0; }
+
+
+const Register StoreConvention::MapRegister() { return x3; }
+}
+}  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_ARM64