Fix #77: Add tests for sqrt of exceptional values

Add tests for the test cases listed in the bug.  Cmucl currently
passes with no additional changes.
2 jobs for rtoy-issue-77-tests-sqrt-exceptional in 11 minutes and 56 seconds
latest
Status Job ID Name Coverage
  Test
passed #2989
linux
linux-runner

00:07:34

passed #2990
osx
osx-runner

00:11:56