[Issue 17940] bool function parameters loaded from struct sometimes miscompiled with -O

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17940

--- Comment #3 from FeepingCreature <default_357-line at yahoo.de> ---
Proposed fix: https://github.com/dlang/dmd/pull/7252

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