[Issue 15962] [REG2.069] Don't strip off asserts to check internal compiler errors

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15962

--- Comment #4 from Basile-z <b2.temp at gmx.com> ---
I've noticed a couple of times in the past months that some cases of
"accept-invalid" bug reports were actually leading to ICE (due to assert) when
tested with the debug built.

Maybe that really important `assert()` should be turned into ICE using a
dedicated function which would itself call `fatal()`. This looks easy at first
glance but what would have to be refactored or not is something that should be
verified, otherwise it's the same as to stop using "-release" for official
binaries.

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