Always initialize library class collection

Art tests are not passing a library path and we are trying to remove Record

Bug: 272250876
Change-Id: Iaa128ad7be450231d0d61579b9b69349d5188e28

src/main/java/com/android/tools/r8/graph/LazyLoadedDexApplication.java

diff --git a/src/main/java/com/android/tools/r8/graph/LazyLoadedDexApplication.java b/src/main/java/com/android/tools/r8/graph/LazyLoadedDexApplication.java
index ee98d51..96d4bfa 100644
--- a/src/main/java/com/android/tools/r8/graph/LazyLoadedDexApplication.java
+++ b/src/main/java/com/android/tools/r8/graph/LazyLoadedDexApplication.java
@@ -284,7 +284,7 @@
     Builder(InternalOptions options, Timing timing) {
       super(options, timing);
       this.classpathClasses = ClasspathClassCollection.empty();
-      this.libraryClasses = null;
+      this.libraryClasses = LibraryClassCollection.empty();
     }
 
     private Builder(LazyLoadedDexApplication application) {

src/main/java/com/android/tools/r8/utils/LibraryClassCollection.java

diff --git a/src/main/java/com/android/tools/r8/utils/LibraryClassCollection.java b/src/main/java/com/android/tools/r8/utils/LibraryClassCollection.java
index c274aad..d1957a4 100644
--- a/src/main/java/com/android/tools/r8/utils/LibraryClassCollection.java
+++ b/src/main/java/com/android/tools/r8/utils/LibraryClassCollection.java
@@ -13,6 +13,10 @@
     super(null, classProvider);
   }
 
+  public static LibraryClassCollection empty() {
+    return new LibraryClassCollection(null);
+  }
+
   @Override
   DexLibraryClass resolveClassConflict(DexLibraryClass a, DexLibraryClass b) {
     return a;