MdePkg/BaseLib: Break out IA32/X64 GCC inline privileged functions

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2800

Break out the IA32/X64 GCC inline functions that can not be used
in a unit test host application into their own source file.  This
does not make any changes to the BaseLib library instance.  This
is in preparation for a new BaseLib instances that is safe to use
with host-based unit test applications.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

MdePkg/Library/BaseLib/BaseLib.inf

@@ -1,7 +1,7 @@
 ## @file
 #  Base Library implementation.
 #
-#  Copyright (c) 2007 - 2019, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2007 - 2020, Intel Corporation. All rights reserved.<BR>
 #  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
 #  Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>
 #  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
@@ -156,6 +156,7 @@
 
 
   Ia32/GccInline.c | GCC
+  Ia32/GccInlinePriv.c | GCC
   Ia32/Thunk16.nasm
   Ia32/EnableDisableInterrupts.nasm| GCC
   Ia32/EnablePaging64.nasm
@@ -310,6 +311,7 @@
   X86PatchInstruction.c
   X86SpeculationBarrier.c
   X64/GccInline.c | GCC
+  X64/GccInlinePriv.c | GCC
   X64/EnableDisableInterrupts.nasm
   X64/DisablePaging64.nasm
   X64/RdRand.nasm