Fix/constant expression runner visit drop

[HerrCai0907]

fix: #5015

• Add a override of visitDrop in ConstantExpressionRunner
• Testcase result changed due to this code can be infer to i32.const 0

  (block $label$4 (result i32)
   (drop
    (local.tee $7
     (local.get $8)
    )
   )
   (i32.const 0)
  )