BaseMemoryLib: Add missing ASSERT()s for some interfaces.

BaseTimerLibLocalApic: Add missing EBC architecture support. Note that this instance is a dummy one since EBC does not support local APIC timer. 
IoLibDxeCpuIo: Add alignment checking & unsupported width checking by using ASSERT()s.


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@311 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseMemoryLibRepStr/ZeroMemWrapper.c

@@ -43,9 +43,10 @@ VOID *
 EFIAPI
 ZeroMem (
   IN      VOID                      *Buffer,
-  IN      UINTN                     Size
+  IN      UINTN                     Length
   )
 {
-  ASSERT (Buffer != NULL);
-  return InternalMemSetMem (Buffer, Size, 0);
+  ASSERT (!(Buffer == NULL && Length > 0));
+  ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
+  return InternalMemSetMem (Buffer, Length, 0);
 }