[JDK-8344599] Adapt JDK-8342103: C2 compiler support for Float16 type and associated operations #20551

Job	Run time
/substratevm on Windows	8m 23s
/compiler style,fullbuild,test JDK21	32m 10s
/compiler build,bootstraplite JDKlatest	4m 39s
/espresso style,fullbuild JDK21	14m 15s
/substratevm style,fullbuild JDK21	11m 45s
/substratevm build,helloworld,native_unittests JDKlatest	21m 6s
/substratevm build,debuginfotest JDKlatest	23m 39s
/substratevm hellomodule JDKlatest	5m 9s
/sulong style,fullbuild,sulongBasic JDK21	20m 57s
/truffle JDK21	33m 32s
/vm build,sulong JDKlatest	27m 21s
/vm build JDKlatest	16m 22s
	3h 39m 18s

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