Revert 21502 - "Move OS::MemCopy and OS::MemMove out of platform to utils"

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index 6f6fe9262abdbc06324de0d74cf44f5c325de0d5..9c7f5a9b4f521477117e56447f354ff20273fb5e 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -107,6 +107,29 @@ intptr_t OS::MaxVirtualMemory() {
 }
 
 
+#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X87
+static void MemMoveWrapper(void* dest, const void* src, size_t size) {
+  memmove(dest, src, size);
+}
+
+
+// Initialize to library version so we can call this at any time during startup.
+static OS::MemMoveFunction memmove_function = &MemMoveWrapper;
+
+// Defined in codegen-ia32.cc.
+OS::MemMoveFunction CreateMemMoveFunction();
+
+// Copy memory area to disjoint memory area.
+void OS::MemMove(void* dest, const void* src, size_t size) {
+  if (size == 0) return;
+  // Note: here we rely on dependent reads being ordered. This is true
+  // on all architectures we currently support.
+  (*memmove_function)(dest, src, size);
+}
+
+#endif  // V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X87
+
+
 class TimezoneCache {
  public:
   TimezoneCache() : initialized_(false) { }
@@ -429,6 +452,16 @@ char* Win32Time::LocalTimezone(TimezoneCache* cache) {
 }
 
 
+void OS::PostSetUp() {
+#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X87
+  OS::MemMoveFunction generated_memmove = CreateMemMoveFunction();
+  if (generated_memmove != NULL) {
+    memmove_function = generated_memmove;
+  }
+#endif
+}
+
+
 // Returns the accumulated user time for thread.
 int OS::GetUserTime(uint32_t* secs,  uint32_t* usecs) {
   FILETIME dummy;
@@ -880,7 +913,7 @@ OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
   if (file_mapping == NULL) return NULL;
   // Map a view of the file into memory
   void* memory = MapViewOfFile(file_mapping, FILE_MAP_ALL_ACCESS, 0, 0, size);
-  if (memory) MemMove(memory, initial, size);
+  if (memory) OS::MemMove(memory, initial, size);
   return new Win32MemoryMappedFile(file, file_mapping, memory, size);
 }