[Issue 18404] Allow selective printing of -vgc output

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18404

Eyal <eyal at weka.io> changed:

           What    |Removed                     |Added
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                 CC|                            |eyal at weka.io

--- Comment #1 from Eyal <eyal at weka.io> ---
That's a great idea.

If there was:

* a way to white-list a specific piece of code to avoid -vgc, e.g: explicit @gc
are filtered from -vgc, or maybe via -vimplicit_gc (that excludes @gc code)

* a way to make -vimplicit_gc outputs compilation errors

Then we could explicitly white-list specific GC code instead of black-listing
GC almost *everywhere*.

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