Java: fix Array_3 byte compiler failures

[Per Bothner]

Andrew Haley wrote:
> How could it be otherwise?  aconst_null doesn't push an array type.

At the source-code level, it has to be converted to an array type,
before you can use it.

However, I tried a more direct example:

   int baz()
   {
     Object[] x = null;
     return x.length;
   }

This generates:

   0: aconst_null
   1: astore_1
   2: aload_1
   3: arraylength
   4: ireturn

So in this case at least case the bytecode has to handle
null_pointer_node.

I withdraw my objection.
-- 
	--Per Bothner
per@bothner.com   http://www.bothner.com/per/