[Issue 21603] Provide deprecation warning or error for placement new syntax

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21603

Kyle <kbcomm at protonmail.com> changed:

           What    |Removed                     |Added
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                URL|                            |https://forum.dlang.org/thr
                   |                            |ead/ksccxhnooldzdtmbwlny at fo
                   |                            |rum.dlang.org
           Hardware|x86                         |x86_64
                 OS|Windows                     |Linux

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