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/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c

@@ -1,6 +1,7 @@
 /** @file
   16550 UART Serial Port library functions
 
+  (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
@@ -184,7 +185,6 @@ GetSerialRegisterBase (
   )
 {
   UINTN                 PciLibAddress;
-  UINTN                 PrimaryBusNumber;
   UINTN                 BusNumber;
   UINTN                 SubordinateBusNumber;
   UINT32                ParentIoBase;
@@ -233,7 +233,6 @@ GetSerialRegisterBase (
     //
     // Retrieve and verify the bus numbers in the PCI to PCI Bridge
     //
-    PrimaryBusNumber     = PciRead8 (PciLibAddress + PCI_BRIDGE_PRIMARY_BUS_REGISTER_OFFSET);
     BusNumber            = PciRead8 (PciLibAddress + PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET);
     SubordinateBusNumber = PciRead8 (PciLibAddress + PCI_BRIDGE_SUBORDINATE_BUS_REGISTER_OFFSET);
     if (BusNumber == 0 || BusNumber > SubordinateBusNumber) {