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In a couple of cases, we use `glval<unknown>` as the result type of an instruction because we can't come up with anything better. Two examples are the result of `VariableAddress[#ellipsis]`, and the address of the temp variable that holds the lvalue result of the conditional operator in `(a ? b : c) = y`. In both cases, we call `getTypeForGLValue(any(UnknownType t))`, but that would have multiple results because `result.hasType(any(UnknownType t), true)` also holds for `CppFunctionGLValueType`. I tightened the result type to ensure we get the right one.