Fast clear all items primitive #11896
Description
We should detect the pattern for clearing all items and make it super cheap and fast:
<!-- Remove items which we will never again use - they just sit around taking up memory otherwise -->
<ItemGroup>
<_AllChildProjectItemsWithTargetPath Remove="@(_AllChildProjectItemsWithTargetPath)"/>
</ItemGroup> <ItemGroup>
<Foo Remove="@(Foo)" />
</ItemGroup>