Add CpuDeadLoop() for PeiCore entry, that means PeiCore should not return.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5661 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/PeiCoreEntryPoint/PeiCoreEntryPoint.c

@@ -19,6 +19,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 // The Library classes this module produced
 //
 #include <Library/PeiCoreEntryPoint.h>
+#include <Library/DebugLib.h>
 
 /**
 
@@ -52,6 +53,12 @@ _ModuleEntryPoint(
 )
 {
   ProcessModuleEntryPointList (SecCoreData, PpiList, NULL);
+  
+  //
+  // Should never return
+  //
+  ASSERT(FALSE);
+  CpuDeadLoop ();  
 }