Refactor dexpreopt for boot jars to allow more complex dependencies.

After this change, the dependency hierachy can be arbitrarily deep. For
example, you can have one boot image that extends another boot image
that extends yet another boot image.

Bug: 269230245
Test: m
Change-Id: I096d0b57bda36b982ecc97378647f9c59071a3bf

1 files changed, 9 insertions, 0 deletions

diff --git a/android/util.go b/android/util.go
index 947af699c..8f4c17daa 100644
--- a/android/util.go
+++ b/android/util.go
@@ -29,6 +29,15 @@ func CopyOf(s []string) []string {
 	return append([]string(nil), s...)
 }
 
+// Concat returns a new slice concatenated from the two input slices. It does not change the input
+// slices.
+func Concat[T any](s1, s2 []T) []T {
+	res := make([]T, 0, len(s1)+len(s2))
+	res = append(res, s1...)
+	res = append(res, s2...)
+	return res
+}
+
 // JoinWithPrefix prepends the prefix to each string in the list and
 // returns them joined together with " " as separator.
 func JoinWithPrefix(strs []string, prefix string) string {