Move EMPTY to RegularImmutableList.

This was requested in #1977 to avoid circular static-init dependencies.
I fear that we have other such problems. We should consider adding a test for them.
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=88131198

guava/src/com/google/common/collect/ImmutableList.java

@@ -21,6 +21,7 @@
 import static com.google.common.base.Preconditions.checkPositionIndexes;
 import static com.google.common.collect.ObjectArrays.arraysCopyOf;
 import static com.google.common.collect.ObjectArrays.checkElementsNotNull;
+import static com.google.common.collect.RegularImmutableList.EMPTY;
 
 import com.google.common.annotations.GwtCompatible;
 
@@ -62,10 +63,6 @@
 @SuppressWarnings("serial") // we're overriding default serialization
 public abstract class ImmutableList<E> extends ImmutableCollection<E>
     implements List<E>, RandomAccess {
-
-  private static final ImmutableList<Object> EMPTY =
-      new RegularImmutableList<Object>(ObjectArrays.EMPTY_ARRAY);
-
   /**
    * Returns the empty immutable list. This set behaves and performs comparably
    * to {@link Collections#emptyList}, and is preferable mainly for consistency
@@ -400,8 +397,8 @@ ImmutableList<E> subListUnchecked(int fromIndex, int toIndex) {
   }
 
   class SubList extends ImmutableList<E> {
-    transient final int offset;
-    transient final int length;
+    final transient int offset;
+    final transient int length;
 
     SubList(int offset, int length) {
       this.offset = offset;

guava/src/com/google/common/collect/RegularImmutableList.java

@@ -22,13 +22,16 @@
 import javax.annotation.Nullable;
 
 /**
- * Implementation of {@link ImmutableList} with one or more elements.
+ * Implementation of {@link ImmutableList} used for 0 or 2+ elements (not 1).
  *
  * @author Kevin Bourrillion
  */
 @GwtCompatible(serializable = true, emulated = true)
 @SuppressWarnings("serial") // uses writeReplace(), not default serialization
 class RegularImmutableList<E> extends ImmutableList<E> {
+  static final ImmutableList<Object> EMPTY =
+      new RegularImmutableList<Object>(ObjectArrays.EMPTY_ARRAY);
+
   private final transient int offset;
   private final transient int size;
   private final transient Object[] array;