Deleted x64\SwitchStack.c Ipf/SwitchStack.c.

Added SwitchStack.c in Baselib\
Rename Ia32/SwitchStack.c to Ia32/InternalSwitchStack.c
Changed _SwitchStack() into InternalSwitchStack() in SwitchStack.asm and SwitchStack.s
Fixed one bug in LinkedList.c, that List length couldn't up to PcdMaximumLinkedListLength. 


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@394 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/BaseLibInternals.h

@@ -114,6 +114,15 @@ InternalMathDivRemS64x64 (
   OUT     INT64                     *Remainder
   );
 
+VOID
+EFIAPI
+InternalSwitchStack (
+  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
+  IN      VOID                      *Context1,
+  IN      VOID                      *Context2,
+  IN      VOID                      *NewStack
+  );
+
 //
 // Ia32 and x64 specific functions
 //