Merge fix from r3913: "Fix bug in backward copy for x64" git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5275 6f19259b-4bc3-4df7-8a09-765794883524
Merge fix from r3913: "Fix bug in backward copy for x64" git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5275 6f19259b-4bc3-4df7-8a09-765794883524