Rollup merge of #158587 - sjwang05:issue-155168, r=JohnTitor check if len of array const arg matches the expected len of the type when lowering to valtree When creating valtrees for arrays passed as const args in `lower_const_arg_array`, we assume the array has the correct length without actually checking the length of the arg, leading to UB at runtime (rust-lang/rust#155168) or an ICE during CTFE (rust-lang/rust#151079). This PR adds a check comparing the expected length of the type with the actual number of elements, similar to `lower_const_arg_tup`. fixes rust-lang/rust#155168
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