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/BaseMemoryLibRepStr/CompareMemWrapper.c

@@ -10,12 +10,14 @@
   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
-  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
 
@@ -33,8 +35,8 @@
   If all Length bytes of the two buffers are identical, then 0 is returned.  Otherwise, the
   value returned is the first mismatched byte in SourceBuffer subtracted from the first
   mismatched byte in DestinationBuffer.
-  If Length > 0 and DestinationBuffer is NULL and Length > 0, then ASSERT().
-  If Length > 0 and SourceBuffer is NULL and Length > 0, then ASSERT().
+  If Length > 0 and DestinationBuffer is NULL, then ASSERT().
+  If Length > 0 and SourceBuffer is NULL, then ASSERT().
   If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT(). 
   If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().