Ensure native peephole opt uses a jump table.

In ORCA/Pascal's code generation, a case statement may use a jump table or a sequence of comparisons depending on whether it is considered sparse. This one was just a little too sparse to use a jump table, but changing it to use one makes it considerably faster. To force generation of a jump table, this commit adds several more explicit cases (even though they don't do anything).

Native.pas

@@ -2013,6 +2013,8 @@ var
                               Remove(ns+2);
                               end; {if}
 
+         {extra explicit cases to ensure this case statement uses a jump table}
+         m_rtl,m_rts,m_jml,m_jsl,m_mvn,m_plp,m_pld,m_txs,
          otherwise: ;
 
          end; {case}