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29954af23a
compiler: Document the offset invariant of `OperandValue::Pair`
A subtle invariant of `OperandValue::Pair` that came up during review and was found to be undocumented.
Visible in code like this:
4b27a04cc8/compiler/rustc_codegen_ssa/src/mir/operand.rs (L376-L392)
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.