Fix emit order to place copyright comments after prologue directives but before helpers #6785

Job	Run time
extension	43s
build	3m 8s
test (noembed)	8m 6s
test (no submodules)	6m 34s
test (macos-latest)	8m 46s
test (race mode)	14m 12s
test (windows-latest)	17m 25s
tidy	1m 57s
smoke	5m 29s
test (concurrent test programs)	9m 3s
generate	5m 23s
format	3m 21s
lint (windows-latest)	13m 33s
baselines	7m 53s
misc	1m 3s
lint (noembed)	4m 26s
lint (ubuntu-latest)	4m 19s
test (ubuntu-latest)	9m 1s
required	4s
	2h 4m 26s

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