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/X64/SwitchStack.asm

@@ -36,12 +36,12 @@
 ;   None
 ;
 ;------------------------------------------------------------------------------
-_SwitchStack PROC
+InternalSwitchStack PROC
     mov     rax, rcx
     mov     rcx, rdx
     mov     rdx, r8
     lea     rsp, [r9 - 20h]
     call    rax
-_SwitchStack ENDP
+InternalSwitchStack ENDP
 
     END