[Issue 17726] Older DMD versions segfault when building Druntime with GCC 7.1

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17726

--- Comment #5 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
Segfault occurs on the line:

        esave = *e;

The line is inside the evalu8 function, which is also the only function needed
to be compiled with -O2 for the bug to manifest.

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