Finish `derive(Clone)` for enums #8493

Job	Run time
build-and-check-ubuntu-32bit	24m 49s
build-and-check-ubuntu-64bit	24m 59s
build-and-check-gcc-5	30m 34s
build-and-check-asan	29m 28s
build-and-check-ubuntu-64bit-glibcxx	26m 57s
	2h 16m 47s

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