1. Updated function headers in all assembly files.

2. Split x86LowLevel.c into a bunch of C files to make images linked with BaseLib smaller.
3. Fixed a few minor bugs.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1066 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/Ia32/ModU64x32.asm

@@ -23,6 +23,14 @@
     .model  flat,C
     .code
 
+;------------------------------------------------------------------------------
+; UINT32
+; EFIAPI
+; InternalMathModU64x32 (
+;   IN      UINT64                    Dividend,
+;   IN      UINT32                    Divisor
+;   );
+;------------------------------------------------------------------------------
 InternalMathModU64x32   PROC
     mov     eax, [esp + 8]
     mov     ecx, [esp + 12]