Bugfix - definition name index skipping with D/I (#2249)

* Bugfix - definition name index skipping with D/I

* Add tests to DefinitionSpec

* Add failing test

* Fix failing test

* Update core/src/main/scala/chisel3/internal/Builder.scala

Co-authored-by: Jack Koenig <jack.koenig3@gmail.com>

* whitespace

* revert package private val

Co-authored-by: Jack Koenig <jack.koenig3@gmail.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>