Support `SaturatedToLargestFloat8NormalConversionEXT` decoration #9472

Job	Run time
Windows (Release)	37m 48s
macOS (Release)	22m 21s
Linux (Release, EnableSharedLibs)	39m 13s
Linux (Debug, NoSharedLibs)	47m 39s
Linux (Release, NoSharedLibs)	39m 19s
	3h 6m 20s

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