Use offsets from `.bgv` file to select appropriate text #21084

Job	Run time
/substratevm on Windows	8m 26s
/compiler style,fullbuild,test JDKlatest	29m 18s
/compiler build,bootstraplite JDKlatest	4m 10s
/espresso style,fullbuild JDK21	13m 15s
/substratevm style,fullbuild JDKlatest	11m 38s
/substratevm build,helloworld,native_unittests JDKlatest	20m 19s
/substratevm build,debuginfotest JDKlatest	22m 37s
/substratevm hellomodule JDKlatest	4m 47s
/sulong style,fullbuild,sulongBasic JDK21	20m 2s
/truffle JDK21	33m 17s
/vm build,sulong JDKlatest	26m 27s
/vm build JDKlatest	15m 32s
	3h 29m 48s

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