MdeModulePkg: 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: Liming Gao <gaoliming@byosoft.com.cn>

MdeModulePkg/Library/VarCheckHiiLib/VarCheckHiiGenFromFv.c

@@ -286,7 +286,7 @@ ParseFv (
                     );
     ASSERT_EFI_ERROR (Status);
 
-    DEBUG_CODE (
+    DEBUG_CODE_BEGIN ();
       EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL   *Fvb2;
       EFI_PHYSICAL_ADDRESS                  FvAddress;
       UINT64                                FvSize;
@@ -303,7 +303,7 @@ ParseFv (
         FvSize = ((EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) FvAddress)->FvLength;
         DEBUG ((DEBUG_INFO , "FvSize    - 0x%08x\n", FvSize));
       }
-    );
+    DEBUG_CODE_END ();
 
     if (ScanAll) {
       //