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const-eval: error when initializing a static writes to that static Fixes https://github.com/rust-lang/rust/issues/142404 by also calling the relevant hook for writes, not just reads. To avoid erroring during the actual write of the initial value, we neuter the hook when popping the final stack frame. Calling the hook during writes requires changing its signature since we cannot pass in the entire interpreter any more. While doing this I also realized a gap in https://github.com/rust-lang/rust/pull/142575 for zero-sized copies on the read side, so I fixed that and added a test. r? `@oli-obk`