EmbeddedSpecRunner/Compiler ClassLoader support #4267

Job	Run time
build-and-verify (2.5, 8, ubuntu-latest)	6m 27s
build-and-verify (2.5, 11, ubuntu-latest)	5m 8s
build-and-verify (3.0, 8, ubuntu-latest)	6m 42s
build-and-verify (3.0, 11, ubuntu-latest)	5m 6s
build-and-verify (3.0, 17, ubuntu-latest)	4m 32s
build-and-verify (3.0, 21, ubuntu-latest)	17m 7s
build-and-verify (3.0, 22, ubuntu-latest)	4m 0s
build-and-verify (4.0, 8, ubuntu-latest)	8m 1s
build-and-verify (4.0, 11, ubuntu-latest)	5m 42s
build-and-verify (4.0, 17, ubuntu-latest)	4m 26s
build-and-verify (4.0, 21, ubuntu-latest)	17m 13s
build-and-verify (4.0, 22, ubuntu-latest)	4m 22s
build-and-verify (2.5, 8, windows-latest)	6m 31s
build-and-verify (3.0, 8, windows-latest)	6m 43s
build-and-verify (4.0, 8, windows-latest)	7m 17s
build-and-verify (2.5, 8, macos-latest)	3m 14s
build-and-verify (3.0, 8, macos-latest)	3m 50s
build-and-verify (4.0, 8, macos-latest)	4m 26s
	2h 0m 47s

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