dtrace should support if and while statements, entry-> and callers[]
Merge pull request #5 from ahrens/dpp

merging from '[ahrens:dpp](https://github.com/ahrens/illumos/commit/7a37422fa1c561d1ff2e67f7d26ff9f08070a9b6)' - dtrace should support if and while statements, entry-> and callers[] 7a37422