* 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
```
31974da6e3