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

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index 058ec358735cf6a0152c6e8e99353d7f8851cfe0..80f993b82b29ecceee5c98e7a50644b9e75feec1 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -515,7 +515,7 @@ void Debug::ThreadInit() {
 
 char* Debug::ArchiveDebug(char* storage) {
   char* to = storage;
-  MemCopy(to, reinterpret_cast<char*>(&thread_local_), sizeof(ThreadLocal));
+  OS::MemCopy(to, reinterpret_cast<char*>(&thread_local_), sizeof(ThreadLocal));
   ThreadInit();
   return storage + ArchiveSpacePerThread();
 }
@@ -523,7 +523,8 @@ char* Debug::ArchiveDebug(char* storage) {
 
 char* Debug::RestoreDebug(char* storage) {
   char* from = storage;
-  MemCopy(reinterpret_cast<char*>(&thread_local_), from, sizeof(ThreadLocal));
+  OS::MemCopy(
+      reinterpret_cast<char*>(&thread_local_), from, sizeof(ThreadLocal));
   return storage + ArchiveSpacePerThread();
 }