1. Added '#pragma pack' directive in BaseLib.h for the structure IA32_DESCRIPTOR

2. Updated SetMem64.asm's to remove any SSE3 instructions.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@901 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseMemoryLibMmx/Ia32/SetMem64.asm

@@ -34,14 +34,14 @@
 ;    IN UINT64 Value
 ;    )
 ;------------------------------------------------------------------------------
-InternalMemSetMem64 PROC    USES    edi
-    movq    mm0, [esp + 16]
-    mov     ecx, [esp + 12]
-    mov     edi, [esp + 8]
-    mov     eax, edi
+InternalMemSetMem64 PROC
+    mov     eax, [esp + 4]
+    mov     ecx, [esp + 8]
+    movq    mm0, [esp + 12]
+    mov     edx, eax
 @@:
-    movntq  [edi], mm0
-    add     edi, 8
+    movntq  [edx], mm0
+    add     edx, 8
     loop    @B
     mfence
     ret