MdeModulePkg: Source fixes and cleanup for ARMGCC compiles

- Fix EFI_IPv4_ADDRESS usages to use a macro to copy the structure
  instead of direct assignment, to avoid runtime alignment errors.
- Fix a EFI_INPUT_KEY usage in TerminalDxe to use CopyMem()  to copy the
   structure instead of direct assignment, to avoid runtime alignment error.
- Delete excess local variables that are initialized but otherwise unused.
- CompilerIntrinsicsLib library now imported for AARCH64, as well as ARM.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Randy Pawell <randy_pawell@hp.com>
Reviewed-by: Olivier Martin <Olivier.Martin@arm.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16471 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Console/TerminalDxe/TerminalConIn.c

@@ -1,6 +1,7 @@
 /** @file
   Implementation for EFI_SIMPLE_TEXT_INPUT_PROTOCOL protocol.
 
+(C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
 Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
@@ -847,7 +848,7 @@ EfiKeyFiFoRemoveOneKey (
     return FALSE;
   }
 
-  *Output                         = TerminalDevice->EfiKeyFiFo->Data[Head];
+  CopyMem (Output, &TerminalDevice->EfiKeyFiFo->Data[Head], sizeof (EFI_INPUT_KEY));
 
   TerminalDevice->EfiKeyFiFo->Head = (UINT8) ((Head + 1) % (FIFO_MAX_NUMBER + 1));