MdePkg BaseMemoryLibOptPei: Convert X64/ScanMem64.asm to NASM

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/ScanMem64.asm to X64/ScanMem64.nasm

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

MdePkg/Library/BaseMemoryLibOptPei/BaseMemoryLibOptPei.inf

@@ -92,6 +92,7 @@
   MemLibGuid.c
 
 [Sources.X64]
+  X64/ScanMem64.nasm
   X64/ScanMem64.asm
   X64/ScanMem64.S
   X64/ScanMem32.asm

MdePkg/Library/BaseMemoryLibOptPei/X64/ScanMem64.nasm

@@ -0,0 +1,55 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, 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:
+;
+;   ScanMem64.Asm
+;
+; Abstract:
+;
+;   ScanMem64 function
+;
+; Notes:
+;
+;   The following BaseMemoryLib instances contain the same copy of this file:
+;
+;       BaseMemoryLibRepStr
+;       BaseMemoryLibMmx
+;       BaseMemoryLibSse2
+;       BaseMemoryLibOptDxe
+;       BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; CONST VOID *
+; EFIAPI
+; InternalMemScanMem64 (
+;   IN      CONST VOID                *Buffer,
+;   IN      UINTN                     Length,
+;   IN      UINT64                    Value
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemScanMem64)
+ASM_PFX(InternalMemScanMem64):
+    push    rdi
+    mov     rdi, rcx
+    mov     rax, r8
+    mov     rcx, rdx
+    repne   scasq
+    lea     rax, [rdi - 8]
+    cmovnz  rax, rcx
+    pop     rdi
+    ret
+