UefiCpuPkg/CpuDxe: split out StartupCode from StartApsStackless()

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16365 6f19259b-4bc3-4df7-8a09-765794883524

UefiCpuPkg/CpuDxe/CpuMp.c

@@ -1454,7 +1454,10 @@ InitializeMpSupport (
 
   InitMpSystemData ();
 
+  PrepareAPStartupCode ();
+
   if (mMpSystemData.NumberOfProcessors == 1) {
+    FreeApStartupCode ();
     FreePages (mCommonStack, EFI_SIZE_TO_PAGES (gMaxLogicalProcessorNumber * gApStackSize));
     return;
   }