Reduce ImmutableSetMultimap.Builder memory usage by using `CompactH…

…ashSet`.

We were already doing this for Android, but it looks potentially valuable on the JVM, too.

RELNOTES=n/a
PiperOrigin-RevId: 591339357

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

@@ -80,7 +80,7 @@ Map<K, V> preservesInsertionOrderOnPutsMap() {
    * for insertions.
    */
   static <E extends @Nullable Object> Set<E> preservesInsertionOrderOnAddsSet() {
-    return Sets.newLinkedHashSet();
+    return CompactHashSet.create();
   }
 
   /**