Replace libdparse with DMD in LabelVarNameCheck #362

Job	Run time
Run all tests (dmd-latest, dmd, ubuntu-22.04, make)	2m 44s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, current)	1m 25s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, min libdparse)	1m 32s
Run all tests (dmd-latest, dmd, macos-latest, make)	11m 26s
Run all tests (dmd-latest, dmd, macos-latest, dub, current)	3m 13s
Run all tests (dmd-latest, dmd, macos-latest, dub, min libdparse)	2m 13s
Run all tests (dmd-latest, dmd, windows-latest, make)	2m 23s
Run all tests (dmd-latest, dmd, windows-latest, dub, current)	2m 40s
Run all tests (dmd-latest, dmd, windows-latest, dub, min libdparse)	2m 51s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, make)	3m 41s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, current)	1m 54s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, min libdparse)	2m 19s
Run all tests (ldc-latest, ldmd2, macos-latest, make)	5m 43s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, current)	2m 53s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, min libdparse)	3m 3s
Run all tests (ldc-latest, ldmd2, windows-latest, make)	5m 47s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, current)	3m 32s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, min libdparse)	3m 28s
Run all tests (dmd-latest, gdc-12, ubuntu-22.04, make)	7m 28s
	1h 10m 15s

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