Since the minimum value of MinSurvivorRatio is 3, the valid mininum value for InitialSurvivorRatio should be 3 as well.

  product(uintx, MinSurvivorRatio, 3, \
          "Minimum ratio of young generation/survivor space size") \
          range(3, max_uintx) \
                                                                            \
  product(uintx, InitialSurvivorRatio, 8, \
          "Initial ratio of young generation/survivor space size") \
          range(0, max_uintx) \

Update the range and add checking in VM startup code.