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Nicholas Bishop
114cf401c2
For calling non-`()` functions, the Carbon->Carbon thunk now takes an extra reference parameter and writes the target function's return value out to that parameter. (At the SemIR level this is how returns already work, but adding this extra reference parameter is needed so that the function is lowered correctly.) The C++ thunk now creates a local variable to be initialized by the Carbon thunk, and then returns that value to the original C++ caller.