Use generics for DepSets

Use Go's generics for DepSets so they don't require a type-specific
wrapper and reflection.

Test: depsets_test.go
Change-Id: I22ba0b7d680d37d2cd05230b0f560d166c4dd20b

android/util_test.go

@@ -74,10 +74,10 @@ func TestFirstUniqueStrings(t *testing.T) {
 
 	for _, testCase := range firstUniqueStringsTestCases {
 		t.Run("list", func(t *testing.T) {
-			f(t, firstUniqueStringsList, testCase.in, testCase.out)
+			f(t, firstUniqueList[string], testCase.in, testCase.out)
 		})
 		t.Run("map", func(t *testing.T) {
-			f(t, firstUniqueStringsMap, testCase.in, testCase.out)
+			f(t, firstUniqueMap[string], testCase.in, testCase.out)
 		})
 	}
 }
@@ -604,11 +604,11 @@ func BenchmarkFirstUniqueStrings(b *testing.B) {
 	}{
 		{
 			name: "list",
-			f:    firstUniqueStringsList,
+			f:    firstUniqueList[string],
 		},
 		{
 			name: "map",
-			f:    firstUniqueStringsMap,
+			f:    firstUniqueMap[string],
 		},
 		{
 			name: "optimal",