Previously when ReleaseResourcesExecution was called, the method blindly
deleted the execution array regardless of whether there was a valid copy
in the control environment. This could potentially lose data. What if
someone wanted to conserve memory on the device by clearing the array of
an output array?

There is also now an internal method that blindly deletes the array.
This is good for internal functions that are doing something to
invalidate the execution data anyway.