[SVSim] Fixed non-firing AssertProperty in SVSim (backport #4087) (#4088)

* [SVSim] Fixed non-firing AssertProperty in SVSim  (#4087)

(cherry picked from commit d3ab477e

)

# Conflicts:
#	src/test/scala/chiselTests/LTLSpec.scala
#	svsim/src/main/scala/verilator/Backend.scala

* Resolve backport conflicts

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Co-authored-by: Amelia Dobis <amelia.dobis@sifive.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>