fix a silly bug in the intrinsic code and add a testcase that would have caught
it
Merge pull request #88 from regehr/intrinsic-fix

fix a silly bug in the intrinsic code and add a testcase that would have...
Assert that expr widths match inst widths
Add developer policy
Function declared but not called and defined
Merge pull request #89 from jubitaneja/extra-function

Function declared but not called and defined
two new tools
* cache_dump reads out cache entries and prints them in various orders;
  this is the beginning of a more powerful tool that will be used to
  create output for compiler developers to look at
* reduce is a delta debugger that minimizes souper optimizations