Replace libdparse with DMD in UselessInitializerChecker #427

Job	Run time
Run all tests (dmd-latest, dmd, ubuntu-22.04, make)	2m 45s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, current)	1m 37s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, min libdparse)	1m 36s
Run all tests (dmd-latest, dmd, windows-latest, make)	2m 0s
Run all tests (dmd-latest, dmd, windows-latest, dub, current)	2m 50s
Run all tests (dmd-latest, dmd, windows-latest, dub, min libdparse)	2m 47s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, make)	3m 43s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, current)	1m 53s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, min libdparse)	2m 8s
Run all tests (ldc-latest, ldmd2, macos-latest, make)	4m 18s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, current)	1m 44s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, min libdparse)	2m 4s
Run all tests (ldc-latest, ldmd2, windows-latest, make)	5m 41s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, current)	3m 15s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, min libdparse)	3m 22s
Run all tests (dmd-latest, gdc-12, ubuntu-22.04, make)	7m 34s
Run all tests (dmd, macos-13, dub, current)	2m 51s
	52m 8s

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