Inline hasElaborateDestructor!(...) into __(needsDestruction, ...)

[nordlow]

For the sake of avoiding template bloat as evaluation of a built trait is magnitudes faster than instantiating any template.

As mentioned in TODO at https://github.com/dlang/dmd/pull/22853/changes#diff-9cf671c1375bf050cf93c1ed0b4b81b30d5ba8822b10b9ef3435fc8f67e85553L289.

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[thewilsonator]

otherwise looks good.

[thewilsonator]

this is internal, we can probably just remove it, but that can be dome later.