[Issue 21169] make checkedint as a drop-in replacement of native int/long

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21169

--- Comment #4 from mw <mingwu at gmail.com> ---
(In reply to moonlightsentinel from comment #1)
> Note that 5. is invalid, the native version errors with
> `-preview=nosharedaccess`

No matter which compiler options are needed, to be able to use as an *drop-in*
replacement, both checkedint and native need to behave the same under the same
flag.

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