S390: Initial impl of S390 asm, masm, code-stubs,...

src/s390/cpu-s390.cc

+// Copyright 2015 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.
+
+// CPU specific code for s390 independent of OS goes here.
+#include "src/v8.h"
+
+#if V8_TARGET_ARCH_S390
+#include "src/assembler.h"
+
+namespace v8 {
+namespace internal {
+
+void CpuFeatures::FlushICache(void* buffer, size_t size) {
+  // Given the strong memory model on z/Architecture, and the single
+  // thread nature of V8 and JavaScript, instruction cache flushing
+  // is not necessary.  The architecture guarantees that if a core
+  // patches its own instruction cache, the updated instructions will be
+  // reflected automatically.
+}
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_TARGET_ARCH_S390