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* pkg/cmdprof: merge into pkg/toolDmitry Vyukov2020-12-251-0/+15
| | | | cmdprof functionality seems to fit well into pkg/tool.
* pkg/tool: add packageDmitry Vyukov2020-12-251-0/+19
Package tool contains various helper utilitites useful for implementation of command line tools. Currently it contains Fail/Failf functions that we commonly use and new support for optional command line flags.