Move platform abstraction to base library

src/base/platform/platform-macos.cc

 // 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.
 
 // Platform-specific code for MacOS goes here. For the POSIX-compatible
 // parts, the implementation is in platform-posix.cc.
 
 #include <dlfcn.h>
 #include <mach/mach_init.h>
 #include <mach-o/dyld.h>
@@ skipping 17 matching lines @@
 #include <string.h>
 #include <sys/resource.h>
 #include <sys/sysctl.h>
 #include <sys/time.h>
 #include <sys/types.h>
 
 #include <cmath>
 
 #undef MAP_TYPE
 
-#include "src/platform.h"
-#include "src/utils.h"
+#include "src/base/macros.h"
+#include "src/base/platform/platform.h"
 
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 
 // Constants used for mmap.
 // kMmapFd is used to pass vm_alloc flags to tag the region with the user
 // defined tag 255 This helps identify V8-allocated regions in memory analysis
 // tools like vmmap(1).
 static const int kMmapFd = VM_MAKE_TAG(255);
 static const off_t kMmapFdOffset = 0;
 
 
@@ skipping 246 matching lines @@
 
 bool VirtualMemory::ReleaseRegion(void* address, size_t size) {
   return munmap(address, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   return false;
 }
 
-} }  // namespace v8::internal
+} }  // namespace v8::base