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Several MLIL and HLIL wrappers passed or interpreted the wrong kind of index, so they silently returned results for unrelated expressions. `ILReferenceSource::expr_idx` is now `instr_idx`, since core stores an instruction index there.
…pression Core maps MLIL expressions to LLIL SSA expressions, but this looked them up in non-SSA LLIL.
It asked non-SSA HLIL for the definition, but used the returned index to fetch an expression from SSA HLIL.
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Several APIs passed an index to the wrong type of IL function, or passed an expression index where core expects an instruction index, or the reverse. The lookups silently returned unrelated expressions as the indexes are not strongly typed.
This PR fixes the Rust MLIL/HLIL bindings,
MediumLevelILInstruction::GetLowLevelIL, and one lookup inefi_resolver. In Rust,ILReferenceSource::expr_idxis nowinstr_idx, because it is an instruction index rather than an expression index.