Separate UnicodeCache out into an own file.

src/runtime/runtime.h

 // Copyright 2012 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.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
+#include "src/unicode.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 // * Each intrinsic is consistently exposed in JavaScript via 2 names:
 //    * %#name, which is always a runtime call.
 //    * %_#name, which can be inlined or just a runtime call, the compiler in
 //      question decides.
 //
@@ skipping 1118 matching lines @@
 inline bool Runtime::AtomicIsLockFree(uint32_t size) {
   return size == 1 || size == 2 || size == 4;
 }
 
 #endif
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_