build: separate compiler and libs

compiler/cl/_testrt/slice2array/in.go

@@ -0,0 +1,8 @@
+package main
+
+func main() {
+	array := [4]byte{1, 2, 3, 4}
+	ptr := (*[4]byte)(array[:])
+	println(array == *ptr)
+	println(*(*[2]byte)(array[:]) == [2]byte{1, 2})
+}