[Issue 19413] Segfault assigning hashmap from slice in CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19413

--- Comment #1 from dlang at ryanjframe.com ---
run.dlang.io runs this successfully from 2.061 to 2.080.1; it segfaults from
2.081.1 to current.

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