LLVMExtra: Add basic (Post)DominatorTree API (#363) #627

Job	Run time
Documentation	44s
Julia release-1.8 - ubuntu-latest - x64	17m 0s
Julia 1.8 - ubuntu-latest - x64	2m 22s
Julia release-1.8 - macOS-latest - x64	12m 45s
Julia 1.8 - macOS-latest - x64	3m 30s
Julia release-1.9 - ubuntu-latest - x64	22m 22s
Julia 1.8 - windows-latest - x64	7m 3s
Julia release-1.9 - macOS-latest - x64	25m 5s
Julia 1.9 - ubuntu-latest - x64	2m 51s
Julia release-1.9 - windows-latest - x64	17m 37s
Julia 1.9 - macOS-latest - x64	6m 8s
Julia master - ubuntu-latest - x64	32m 32s
Julia 1.9 - windows-latest - x64	7m 7s
Julia master --opaque-pointers - ubuntu-latest - x64	30m 22s
Julia nightly - ubuntu-latest - x64	3m 48s
Julia nightly - macOS-latest - x64	4m 19s
Julia nightly - windows-latest - x64	6m 24s
Julia nightly --opaque-pointers - ubuntu-latest - x64	4m 48s
Julia nightly --opaque-pointers - macOS-latest - x64	4m 30s
Julia nightly --opaque-pointers - windows-latest - x64	7m 22s
	3h 38m 39s

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