1. added functions header for BaseUefiDecompressLi

2. added some internal functions header for BaseLib
3. added EFIAPI for some internal assembly files declare

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1050 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/SwitchStack.c

@@ -26,6 +26,7 @@
 
   If EntryPoint is NULL, then ASSERT().
   If NewStack is NULL, then ASSERT().
+  For IPF CPUs, if NewStack is not aligned on a 16-byte boundary, then ASSERT().
 
   @param  EntryPoint  A pointer to function to call with the new stack.
   @param  Context1    A pointer to the context to pass into the EntryPoint