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* SSA pass (#1049)Alon Zakai2017-06-131-0/+55
* Add SSA pass which ensures a single assign for each local, except for merged locals where we ensure exactly a single assign from one of the paths leading to that use * Also add InstrumentLocals pass, useful for debugging locals (similar to InstrumentMemory but for locals) * Fix a PickLoadSigns bug with tees not being ignored, which was not noticed until now because we ran it on flatter output by default, but the ssa pass uncovered the bug