[Issue 19164] malloc may be considered pure when failure results in program exit (no need to reset errno)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19164

--- Comment #8 from Nathan S. <n8sh.secondary at hotmail.com> ---
>If it was only to improve already existing code, it should've been
>done there locally for that code.

BTW, the first version of the PR was like that, but Sebastian Wilzbach & Petar
Kirov objected convincingly on the grounds that it caused needless code
duplication.

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