Test for ISD::FP_ROUND_INREG?

Do we have a test that exercises ISD::FP_ROUND_INREG in
SelectionDAGLegalize::ExpandNode()?

I ask because I'm working on code that reuses that block in the switch
and I'm trying to write a test. But I'm having trouble and would like to
see what a working test for the existing code looks like. A quick grep of
the tree doesn't show anything.

Ideas?

The coverage report from the bot shows its uncovered.

http://lab.llvm.org:8080/coverage/coverage-reports/llvm/coverage/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp.html#L3057