Replace libdparse with DMD in LabelVarNameCheck #360

Job	Run time
Run all tests (dmd-latest, dmd, ubuntu-22.04, make)	2m 41s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, current)	1m 22s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, min libdparse)	1m 36s
Run all tests (dmd-latest, dmd, macos-latest, make)	3m 44s
Run all tests (dmd-latest, dmd, macos-latest, dub, current)	2m 24s
Run all tests (dmd-latest, dmd, macos-latest, dub, min libdparse)	2m 36s
Run all tests (dmd-latest, dmd, windows-latest, make)	2m 14s
Run all tests (dmd-latest, dmd, windows-latest, dub, current)	2m 43s
Run all tests (dmd-latest, dmd, windows-latest, dub, min libdparse)	3m 9s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, make)	3m 33s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, current)	2m 3s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, min libdparse)	2m 8s
Run all tests (ldc-latest, ldmd2, macos-latest, make)	12m 37s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, current)	3m 54s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, min libdparse)	3m 33s
Run all tests (ldc-latest, ldmd2, windows-latest, make)	5m 39s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, current)	3m 34s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, min libdparse)	3m 50s
Run all tests (dmd-latest, gdc-12, ubuntu-22.04, make)	7m 26s
	1h 10m 46s

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