1) Fix bugs in BaseMemoryLibOptXXX instances in MdePkg.

2) Add BaseMemoryLibOptXXX in MdePkg.dsc.
3) Clean up the MdeModulePkg.dsc.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4286 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseMemoryLibOptDxe/Ia32/SetMem.S

@@ -37,15 +37,15 @@
 _InternalMemSetMem:
     push    %edi
     movl    12(%esp),%ecx
-    movl    16(%esp),%al
+    movb    16(%esp),%al
     movb    %ah, %al
-    shrd    %edx, %eax, $16
-    shld    %eax, %edx, $16
+    shrd    $16, %eax, %edx
+    shld    $16, %edx, %eax
     movl    %edx, %ecx
     movl    8(%esp),%edi
-    shr     $2, %ecx
+    shrd    $2, %ecx, %ecx
     rep 
-    stosd
+    stosl
     movl    %ecx, %edx
     andl    $3, %ecx
     rep