jlfwong / speedscope / 13929251999

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Add support for FreeBSD's pmcstat callgraph format (#502)

* Let tests run without bash

* Import pmcstat callgraph format

This eliminates the need for stackcollapse-pmc.pl and its dependency on
Perl to import FreeBSD callgraphs.  Tracing can be done completely with
tools included in the base system.  For example:

  ```
  # kldload hwpmc
  # pmcstat -S instructions -O sample.out sleep 1
  # pmcstat -R sample.out -G sample.pmcstat.graph
  ```

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