Fixed indexOutOfBounds bug when the last bytecode of a function has 0 size

[onlinecco]

If a label or any bytecode with size 0 is the last bytecode of a function. There will be an index out of bounds exception at at cafebabe.CodeHandler$$anonfun$computeMaxStack$1.apply(CodeHandler.scala:156)

This is caused by the following code in CodeHandler.scala

val actualSize = abcList.map(_.size).sum
val codeArray = new Array[AbstractByteCode](actualSize)

locally {
  var pc = 0
  for(abc <- abcList) {
    codeArray(pc) = abc
    pc += abc.size
  }
}

actualSize is calculated as the sum of size of all instructions where the size of a label instruction is 0. But if a label is at the end of the bytecode list, and the value of pc will equal to the the calculated actualSize therefore caused the index out of bounds exception on the codeArray.