Rebase stable6

[thewilsonator]

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[dlang-bot]

Thanks for your pull request and interest in making D better, @thewilsonator! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
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• My PR is fully covered with tests (you can see the coverage diff by visiting the details link of the codecov check)
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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	24337	critical	Segfault when printing an int[] cast from a string literal
✓	24431	regression	dmd -vcg-ast crashes printing failed template instantiation
✓	24599	regression	[REG2.103] Wrongly elided TypeInfo emission leading to undefined symbols at link-time
✓	24687	regression	[REG2.110] Cannot cast string-imports to select overload anymore
✓	24699	regression	[REG2.108] No short-circuit evaluation of mixing template bool argument
✓	24731	normal	IFTI cannot handle integer expressions
✓	24760	normal	ICE on variadic after default argument
✓	24764	normal	ICE when -vcg-ast prints imported invariant
✓	24790	normal	-vcg-ast ICE on lowered assign exp

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#16967"