MdePkg BaseMemoryLibOptPei: Convert X64/ZeroMem.asm to NASM

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

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

MdePkg/Library/BaseMemoryLibOptPei/BaseMemoryLibOptPei.inf

@@ -107,6 +107,7 @@
   X64/CompareMem.nasm
   X64/CompareMem.asm
   X64/CompareMem.S
+  X64/ZeroMem.nasm
   X64/ZeroMem.asm
   X64/ZeroMem.S
   X64/SetMem64.asm

MdePkg/Library/BaseMemoryLibOptPei/X64/ZeroMem.nasm

@@ -0,0 +1,49 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   ZeroMem.Asm
+;
+; Abstract:
+;
+;   ZeroMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+;  VOID *
+;  InternalMemZeroMem (
+;    IN VOID   *Buffer,
+;    IN UINTN  Count
+;    );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemZeroMem)
+ASM_PFX(InternalMemZeroMem):
+    push    rdi
+    push    rcx
+    xor     rax, rax
+    mov     rdi, rcx
+    mov     rcx, rdx
+    shr     rcx, 3
+    and     rdx, 7
+    rep     stosq
+    mov     ecx, edx
+    rep     stosb
+    pop     rax
+    pop     rdi
+    ret
+