Add additional test to check that floating point ranges are implemented in right way.  Test exposes refcounting bug.
Add additional test to check that floating point ranges are implemented in right way.  Test exposes refcounting bug.

git-svn-id: 47705994653588c662f4ea400dfe88107361c0e2@14204 dc4e9af1-7f46-4ead-bba6-71afc04862de

JohnPJenkins/swift-t,swift-lang/swift-t,swift-lang/swift-t,JohnPJenkins/swift-t,blue42u/swift-t,blue42u/swift-t,swift-lang/swift-t,basheersubei/swift-t,basheersubei/swift-t,blue42u/swift-t,blue42u/swift-t,JohnPJenkins/swift-t,blue42u/swift-t,swift-lang/swift-t,JohnPJenkins/swift-t,swift-lang/swift-t,JohnPJenkins/swift-t,basheersubei/swift-t,basheersubei/swift-t,swift-lang/swift-t,swift-lang/swift-t,basheersubei/swift-t,blue42u/swift-t,JohnPJenkins/swift-t,basheersubei/swift-t,basheersubei/swift-t,JohnPJenkins/swift-t,blue42u/swift-t