Fix poor performance of sameSource predicate #3060

Job	Run time
Prepare supported CodeQL environment matrix	9s
Run release tests	16s
Run Guideline Recategorization tests	7s
Run analysis report tests (2.19.4, codeql-cli/v2.19.4, codeql-bundle-v2.19.4)	5m 33s
	6m 5s

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