Throw OverflowError when the field offset / size overflows.

[yuyichao]

Improve #11320.

This doesn't completely fix it but should be the right thing to do anyway.

@ScottPJones

[yuyichao]

Note that the current overflow checking relies on size_t never overflow, which is true now since each increment is small enough. We do need special care if we increase the size of the size and offset field, especially on 32-bit.

[yuyichao]

Test done:

yuyichao% ./julia -f -e 'Enumerate((Int, 1:10000...))'
ERROR: OverflowError()
 in process_options at ./client.jl:288
 in _start at ./client.jl:409

[yuyichao]

I agree the error message is not very informative but I guess we'd better live with it before error handling/reporting is not a big issue anymore...

[ScottPJones]

Thanks, @yuyichao... this would be nasty for a lot of the stuff I'm doing!

[yuyichao]

I guess tuple is not meant to be used as a long immutable array. I can see why it is useful though...
Maybe #11242 addresses some of this?

[timholy]

#11242 doesn't address this issue.

[vtjnash]

lgtm