Don't emit nodes when calling .asBool on a Bool (backport #3637) (#3639)

* Don't emit nodes when calling .asBool on a Bool

(cherry picked from commit d5e65a33

)

# Conflicts:
#	src/test/scala/chiselTests/LTLSpec.scala
#	src/test/scala/chiselTests/VerificationSpec.scala

* Resolve backport conflicts

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Co-authored-by: Jack Koenig <koenig@sifive.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>