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* Spelling fixesLarry Doolittle2017-09-241-1/+1
| | | | Comments only, no change to functionality
* opt: Start optimizing dead code a bitMichael Matz2016-12-151-0/+122
If a condition is always zero/non-zero we can omit the then or else code. This is complicated a bit by having to deal with labels that might make such code reachable without us yet knowing during parsing.