Replace libdparse with DMD in LabelVarNameCheck #358

Job	Run time
Run all tests (dmd-latest, dmd, ubuntu-22.04, make)	3m 0s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, current)	1m 23s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, min libdparse)	1m 38s
Run all tests (dmd-latest, dmd, macos-latest, make)	3m 45s
Run all tests (dmd-latest, dmd, macos-latest, dub, current)	2m 13s
Run all tests (dmd-latest, dmd, macos-latest, dub, min libdparse)	3m 1s
Run all tests (dmd-latest, dmd, windows-latest, make)	2m 23s
Run all tests (dmd-latest, dmd, windows-latest, dub, current)	2m 46s
Run all tests (dmd-latest, dmd, windows-latest, dub, min libdparse)	2m 53s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, make)	3m 40s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, current)	1m 47s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, min libdparse)	2m 19s
Run all tests (ldc-latest, ldmd2, macos-latest, make)	13m 42s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, current)	3m 49s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, min libdparse)	3m 32s
Run all tests (ldc-latest, ldmd2, windows-latest, make)	5m 30s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, current)	3m 33s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, min libdparse)	3m 54s
Run all tests (dmd-latest, gdc-12, ubuntu-22.04, make)	7m 28s
	1h 12m 16s

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