Don't report unasserted shared changes in `Reducer._printChanges()` #6143

Job	Run time
xcodebuild (16) (test, IOS, 16.0)	9m 45s
xcodebuild (15) (test, IOS, 15.4)	23m 42s
xcodebuild (16) (test, MACOS, 16.0)	4m 58s
Check Macro Compatibility	3m 9s
xcodebuild (15) (test, MAC_CATALYST, 15.4)	13m 30s
Examples	12m 24s
xcodebuild (16) (IOS, 16.0)	8m 5s
xcodebuild (15) (test, MACOS, 15.4)	14m 53s
xcodebuild (16) (MACOS, 16.0)	4m 46s
xcodebuild (15) (test, TVOS, 15.4)	16m 53s
Library (evolution)	3m 23s
xcodebuild (15) (test, VISIONOS, 15.4)	37m 2s
xcodebuild (15) (test, WATCHOS, 15.4)	32m 51s
xcodebuild (15) (IOS, 15.2)	6m 13s
xcodebuild (15) (MACOS, 15.2)	4m 11s
	3h 15m 45s

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