UefiCpuPkg: Change complex DEBUG_CODE() to DEBUG_CODE_BEGIN/END()

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3767

Update use of DEBUG_CODE(Expression) if Expression is a complex code
block with if/while/for/case statements that use {}.

Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>

UefiCpuPkg/CpuDxe/CpuDxe.c

@@ -1071,7 +1071,7 @@ AddMemoryMappedIoSpace (
     }
   }
 
-  DEBUG_CODE (
+  DEBUG_CODE_BEGIN ();
     //
     // Make sure there are adjacent descriptors covering [Base, Base + Length).
     // It is possible that they have not been merged; merging can be prevented
@@ -1089,7 +1089,7 @@ AddMemoryMappedIoSpace (
       ASSERT (Descriptor.GcdMemoryType == EfiGcdMemoryTypeMemoryMappedIo);
       ASSERT ((Descriptor.Capabilities & Capabilities) == Capabilities);
     }
-    );
+  DEBUG_CODE_END ();
 
 FreeMemorySpaceMap:
   FreePool (MemorySpaceMap);
@@ -1212,4 +1212,3 @@ InitializeCpu (
 
   return Status;
 }
-