MdePkg BaseLib: Convert X64/ReadLdtr.asm to NASM

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/ReadLdtr.asm to X64/ReadLdtr.nasm

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>

MdePkg/Library/BaseLib/BaseLib.inf

@@ -511,6 +511,7 @@
   X64/FxSave.asm | MSFT
   X64/WriteLdtr.nasm| MSFT
   X64/WriteLdtr.asm | MSFT
+  X64/ReadLdtr.nasm| MSFT
   X64/ReadLdtr.asm | MSFT
   X64/WriteIdtr.asm | MSFT
   X64/ReadIdtr.asm | MSFT
@@ -616,6 +617,7 @@
   X64/FxSave.asm | INTEL
   X64/WriteLdtr.nasm| INTEL
   X64/WriteLdtr.asm | INTEL
+  X64/ReadLdtr.nasm| INTEL
   X64/ReadLdtr.asm | INTEL
   X64/WriteIdtr.asm | INTEL
   X64/ReadIdtr.asm | INTEL

MdePkg/Library/BaseLib/X64/ReadLdtr.nasm

@@ -0,0 +1,38 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+;   ReadLdtr.Asm
+;
+; Abstract:
+;
+;   AsmReadLdtr function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT16
+; EFIAPI
+; AsmReadLdtr (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmReadLdtr)
+ASM_PFX(AsmReadLdtr):
+    sldt    eax
+    ret
+