Rollup merge of #133704 - RalfJung:promoted-size-overflow-ice, r=compiler-errors

fix ICE when promoted has layout size overflow

Turns out there is no reason to distinguish `tainted_by_errors` and `can_be_spurious` here, we can just track whether we allow this even in "infallible" constants.

Fixes rust-lang/rust#125476

Author: GuillaumeGomez