Add tests for the druntime fix for destroy on large aggregates (issue 21097)

[JohanEngelen]

This requires druntime fix: dlang/druntime#3467

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✗	21097	regression	[REG2.083] Stack exhaustion upon large struct .destroy

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#12509"

[MoonlightSentinel]

Druntime tests do not belong into dmd. You should rather add this test in the test directory of druntime.

[RazvanN7]

@JohanEngelen as @MoonlightSentinel pointed out, this test should be placed in the test directory of druntime. Feel free to close.

[JohanEngelen]

@MoonlightSentinel Ah I didn't know that druntime had its own test dir. Do you have suggestions in which subfolder to add this test?

[MoonlightSentinel]

Not really, I don't think there is an appropriate folder ATM. But you can also create a new one.