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Alan Donovan authored
The correct semantics of named result parameters and deferred procedures cannot be implemented with the existing Ret instruction alone, since the required sequence is: (1) evaluate return operands and parallel-assign them to named result parameters (2) invoke deferred procedures (3) load named result parameters to form result tuple. We introduce a new 'rundefers' instruction that explicitly invokes the deferred procedure calls, and we generate code that follows the sequence above. Most functions do not use deferred procedures but this cannot be known in a single pass. So, we add an optimisation to eliminate redundant 'rundefers'; it is piggybacked on the existing pass done for "lifting". Added tests. R=gri CC=golang-dev https://golang.org/cl/7411043
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