[Issue 20900] dmd crashes on static foreach over infinite range

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20900

--- Comment #1 from Bolpat <qs.il.paperinik at gmail.com> ---
I’d suggest DMD abort when a `static foreach` surpasses 2^16−1 (65,535)
iterations; also add a compiler switch (suggestion:
`-static-foreach-depth=<number>`) to change the aforementioned default for the
rare cases it’s needed. Alternatively, a `pragma` could work well, too.

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