SI-7406 crasher with specialized lazy val

This reverts a tiny bit of f7d5f45aa7 where the crasher was
introduced. The enclosed test case compiles and runs under 2.9,
but prints the wrong answer. It crashes in 2.10 and until this
patch. Now it compiles and prints the right answer.
Merge pull request #3297 from paulp/pr/7406

 crasher with specialized lazy val