Do not clear debug register. New performance code does not use Debug register to log performance.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2077 6f19259b-4bc3-4df7-8a09-765794883524

EdkNt32Pkg/Library/EdkGenericBdsLib/Performance.c

@@ -23,17 +23,6 @@ Abstract:
 
 #include "Performance.h"
 
-VOID
-ClearDebugRegisters (
-  VOID
-  )
-{
-  //
-  // BugBug: We should not need to do this. We need to root cause this bug!!!!
-  //
-  AsmWriteDr0 (0);
-  AsmWriteDr1 (0);
-}
 
 STATIC
 VOID
@@ -374,8 +363,6 @@ Returns:
 
 Done:
 
-  ClearDebugRegisters ();
-
   mPerfHeader.Signiture = 0x66726550;
 
   //