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/MdeModulePkg.dsc

@@ -1,6 +1,7 @@
 ## @file
 # EFI/PI Reference Module Package for All Architectures
 #
+# (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
 # Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
 #
 #    This program and the accompanying materials
@@ -145,10 +146,10 @@
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
   DebugLib|MdePkg/Library/UefiDebugLibStdErr/UefiDebugLibStdErr.inf
 
-[LibraryClasses.ARM]
+[LibraryClasses.ARM, LibraryClasses.AARCH64]
   #
-  # It is not possible to prevent the ARM compiler for generic intrinsic functions.
-  # This library provides the instrinsic functions generate by a given compiler.
+  # It is not possible to prevent ARM compiler calls to generic intrinsic functions.
+  # This library provides the instrinsic functions generated by a given compiler.
   # [LibraryClasses.ARM] and NULL mean link this library into all ARM images.
   #
   NULL|ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf