1. Change 0 == Length style to Length == 0

2. Clean BasePeCoff library instance, only keep one copy PeCoffLoaderEx.c file for IA32, X64 and IPF arch
3. Clean the confused comments

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5927 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseMemoryLibMmx/ZeroMemWrapper.c

@@ -12,12 +12,14 @@
 
   Module Name:  ZeroMemWrapper.c
 
-  The following BaseMemoryLib instances share the same version of this file:
+  The following BaseMemoryLib instances contain the same copy of this file:
 
     BaseMemoryLib
     BaseMemoryLibMmx
     BaseMemoryLibSse2
     BaseMemoryLibRepStr
+    BaseMemoryLibOptDxe
+    BaseMemoryLibOptPei
     PeiMemoryLib
     DxeMemoryLib
 
@@ -45,7 +47,7 @@ ZeroMem (
   IN UINTN  Length
   )
 {
-  ASSERT (!(NULL == Buffer && Length > 0));
+  ASSERT (!(Buffer == NULL && Length > 0));
   ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
   return InternalMemZeroMem (Buffer, Length);
 }