Make vtkDataArray::ComputeRange() thread-safe

This changes the vtkDataArray::ComputeRange() method to be thread-
safe by passing it the range array rather than having it set the
internal 'this->Range' variable.

This also updates GetRange() to use the thread-safe API.

Change-Id: Ieb281e26f8f0b6a1f521176294d388e026ad0865
Merge topic 'thread-safe-compute-range' into master

51f66a47 Make vtkDataArray::ComputeRange() thread-safe