Make runtimeChecked a standard feature #261

Job	Run time
scala-library-nonbootstrapped	2m 41s
scala3-library-bootstrapped	5m 9s
tasty-core-nonbootstrapped	2m 47s
scala3-library-nonbootstrapped	2m 32s
tasty-core-bootstrapped	5m 6s
scala3-compiler-bootstrapped	6m 48s
test-scala3-sbt-bridge-nonbootstrapped	5m 4s
scala3-staging	6m 48s
scala3-sbt-bridge-bootstrapped	6m 51s
scala3-tasty-inspector	7m 28s
test-tasty-core-bootstrapped	5m 20s
test-tasty-core-nonbootstrapped	2m 33s
test-scala3-sbt-bridge-bootstrapped	6m 39s
scala3-sbt-bridge-nonbootstrapped	4m 18s
scala3-compiler-nonbootstrapped	4m 23s
scala-library-bootstrapped	3m 55s
scala-library-cc	3m 58s
	1h 22m 20s

Provide feedback