Clean up key path bitcasting. (#3411) #6039

Job	Run time
Check Macro Compatibility	3m 18s
Library (evolution)	3m 46s
Examples	52m 17s
xcodebuild (test, IOS, 15.4)	29m 4s
xcodebuild (test, IOS, 16.0)	42m 22s
xcodebuild (test, MAC_CATALYST, 15.4)	36m 59s
xcodebuild (test, MACOS, 15.4)	20m 32s
xcodebuild (test, MACOS, 16.0)	21m 20s
xcodebuild (test, TVOS, 15.4)	32m 52s
xcodebuild (test, VISIONOS, 15.4)	36m 7s
xcodebuild (test, WATCHOS, 15.4)	33m 9s
xcodebuild (IOS, 15.2)	3m 48s
xcodebuild (MACOS, 15.2)	3m 52s
	5h 19m 26s

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