MdePkg BaseLib: Convert X64/ReadDr3.asm to NASM

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/ReadDr3.asm to X64/ReadDr3.nasm

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

MdePkg/Library/BaseLib/BaseLib.inf

@@ -559,6 +559,7 @@
   X64/ReadDr5.asm | MSFT
   X64/ReadDr4.nasm| MSFT
   X64/ReadDr4.asm | MSFT
+  X64/ReadDr3.nasm| MSFT
   X64/ReadDr3.asm | MSFT
   X64/ReadDr2.asm | MSFT
   X64/ReadDr1.asm | MSFT
@@ -688,6 +689,7 @@
   X64/ReadDr5.asm | INTEL
   X64/ReadDr4.nasm| INTEL
   X64/ReadDr4.asm | INTEL
+  X64/ReadDr3.nasm| INTEL
   X64/ReadDr3.asm | INTEL
   X64/ReadDr2.asm | INTEL
   X64/ReadDr1.asm | INTEL

MdePkg/Library/BaseLib/X64/ReadDr3.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:
+;
+;   ReadDr3.Asm
+;
+; Abstract:
+;
+;   AsmReadDr3 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINTN
+; EFIAPI
+; AsmReadDr3 (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmReadDr3)
+ASM_PFX(AsmReadDr3):
+    mov     rax, dr3
+    ret
+