Retain original order in generated code. #1958

Job	Run time
build (2_12, mima)	1m 6s
build (2_12, e2e)	4s
build (2_12, test)	2m 47s
build (2_13, mima)	1m 8s
conformance	1m 36s
build (2_13, e2e)	9s
build (2_13, test)	2m 47s
build (3, mima)	4s
build (3, e2e)	6s
build (3, test)	2m 46s
build (2_12, examples_and_formatting)	2m 30s
build (2_13, scala3_compat_test)	2m 45s
build (3, scala3_compat_test)	2m 47s
ci-passed	0s
	20m 35s

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