Don't emit nodes when calling .asBool on a Bool (backport #3637) #6527

Job	Run time
Standard Library Tests (2.13.10)	1m 11s
Formatting	50s
Standard Library Tests (2.12.17)	1m 25s
ci (ubuntu-20.04, 8, 2.13.10, 2.4, firtool-1.37.0)	1m 6s
ci (ubuntu-20.04, 8, 2.12.17, 2.4, firtool-1.37.0)	1m 4s
Integration Tests (w/ chiseltest)	1m 16s
Test Scala-CLI Template	1m 7s
Build Mdoc & Website	2m 27s
check tests	0s
all tests passed	1s
publish	0s
	10m 27s

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