Don't box cached value until it needs to be boxed

Summary: Not sure why this was being boxed immediately - the correct thing to do is just to box when necessary (e.g. when doing comparisons), and have the model have the actual type (boxed or unboxed).

Reviewed By: astreet

Differential Revision: D16359485

fbshipit-source-id: 7e9c1031c5c484f0ed41db4a6ab81412f2be0035

litho-processor/src/main/java/com/facebook/litho/specmodels/model/CachedValueParamModel.java

@@ -38,7 +38,7 @@ public TypeSpec getTypeSpec() {
 
   @Override
   public TypeName getTypeName() {
-    return mParamModel.getTypeName().box();
+    return mParamModel.getTypeName();
   }
 
   @Override