[fuzz testcase] "data.drop segment index out of bounds"

[kripken]

Testcase:

(module
 (memory $0 1 1)
 (data (i32.const 0) "")
 (func $func
  (data.drop 0)
 )
)

Command:

$ bin/wasm-opt w.wast --memory-packing -all

cc @tlively I guess it's not valid to remove a segment that is referred to from a bulk memory operation?