view .arcconfig @ 39254:284440041141

tracing: new module to make tracing events in hg easier

This lives in hgdemandimport because I want to instrument a bunch of
low-level stuff including the bare `hg` script and demandimport, so it
can't live at a higher layer.

Differential Revision: https://phab.mercurial-scm.org/D4344

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