Replace libdparse in UnusedResultChecker #441

Job	Run time
Run all tests (dmd-latest, dmd, ubuntu-22.04, make)	2m 49s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, current)	1m 26s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, min libdparse)	1m 45s
Run all tests (dmd-latest, dmd, windows-latest, make)	2m 10s
Run all tests (dmd-latest, dmd, windows-latest, dub, current)	2m 24s
Run all tests (dmd-latest, dmd, windows-latest, dub, min libdparse)	3m 15s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, make)	3m 43s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, current)	1m 49s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, min libdparse)	1m 59s
Run all tests (ldc-latest, ldmd2, macos-latest, make)	4m 12s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, current)	1m 46s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, min libdparse)	1m 49s
Run all tests (ldc-latest, ldmd2, windows-latest, make)	5m 27s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, current)	3m 6s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, min libdparse)	3m 30s
Run all tests (dmd-latest, gdc-12, ubuntu-22.04, make)	7m 14s
Run all tests (dmd, macos-13, dub, current)	2m 20s
	50m 44s

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