fix #22323 - error "cannot get frame pointer" with AA in struct literal

[rainers]

deep copy manifest constant if it contains AA literal, so that it runs semantic again on lowered code

[dlang-bot]

Thanks for your pull request, @rainers!

Bugzilla references

Your PR doesn't reference any Bugzilla issue.

If your PR contains non-trivial changes, please reference a Bugzilla issue or create a manual changelog.

⚠️⚠️⚠️ Warnings ⚠️⚠️⚠️

• In preparation for migrating from Bugzilla to GitHub Issues, the issue reference syntax has changed. Please add the word "Bugzilla" to issue references. For example, Fix Bugzilla Issue 12345 or Fix Bugzilla 12345.(Reminder: the edit needs to be done in the Git commit message, not the GitHub pull request.)

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 "stable + dmd#22324"

[thewilsonator]

target stable so that LDC can pick this up. otherwise looks good.

[thewilsonator]

thanks

[rainers]

target stable so that LDC can pick this up. otherwise looks good.

ok, rebased to stable.