[GR-61156] Add optional StageFlag parameter to OpaqueValueNode #20976

Job	Run time
/substratevm on Windows	8m 17s
/compiler style,fullbuild,test JDK21	31m 21s
/compiler build,bootstraplite JDKlatest	4m 7s
/espresso style,fullbuild JDK21	12m 54s
/substratevm style,fullbuild JDKlatest	11m 40s
/substratevm build,helloworld,native_unittests JDKlatest	20m 11s
/substratevm build,debuginfotest JDKlatest	23m 36s
/substratevm hellomodule JDKlatest	4m 43s
/sulong style,fullbuild,sulongBasic JDK21	20m 22s
/truffle JDK21	41m 26s
/vm build,sulong JDKlatest	26m 42s
/vm build JDKlatest	15m 51s
	3h 41m 10s

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