Move platform abstraction to base library

src/base/platform/platform-linux.cc

Index: src/base/platform/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/base/platform/platform-linux.cc
similarity index 99%
rename from src/platform-linux.cc
rename to src/base/platform/platform-linux.cc
index 9d7c8cd14137a92dbe15fda5827897fb691cab90..9e1e899251698286f91da9089a5be0f5966557c2 100644
--- a/src/platform-linux.cc
+++ b/src/base/platform/platform-linux.cc
@@ -43,12 +43,12 @@
 
 #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 {
 
 
 #ifdef __arm__
@@ -429,4 +429,4 @@ bool VirtualMemory::HasLazyCommits() {
   return true;
 }
 
-} }  // namespace v8::internal
+} }  // namespace v8::base