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4e69aebbbd
typeCheckArgumentChildIndependently when we want an lvalue back, instead of it always producing an lvalue. Provide it in a couple of places, the most interesting of which is when forming a call to an operator where an InOutExpr is implicitly provided by the fact that the operator is an 'assignment' operator (something we don't actually model right in the language at the moment for unary operators). Producing this uses the candidate list we get from analyzing the function, which makes this the first example of using the callee to provide type information when analyzing an argument subexpression. All this work for NFC. :-) Swift SVN r30600