Split wrapper functions into separate source files to reduce image code size

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@168 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseMemoryLib/CopyMemWrapper.c

@@ -23,7 +23,7 @@
 
 **/
 
-#include "MemLibWrappers.h"
+#include "MemLibInternals.h"
 
 /**
   Copy Length bytes from Source to Destination.
@@ -51,8 +51,14 @@ CopyMem (
   IN      UINTN                     Length
   )
 {
-  ASSERT (Length <= MAX_ADDRESS - (UINTN)Destination + 1);
-  ASSERT (Length <= MAX_ADDRESS - (UINTN)Source + 1);
+  ASSERT (
+    Destination == NULL ||
+    Length <= MAX_ADDRESS - (UINTN)Destination + 1
+    );
+  ASSERT (
+    Source == NULL ||
+    Length <= MAX_ADDRESS - (UINTN)Source + 1
+    );
   if (Destination == Source || Length == 0) {
     return Destination;
   }