for review (XXL): 6655638 method handles for invokedynamic

[John Rose]

On Apr 7, 2009, at 12:37 AM, John Rose wrote:

>> Don't do the (int32_t)NULL_WORD cast here:
>>    __ cmpptr(arg_slots.as_register(), (int32_t) NULL_WORD);
>
> Right.


I was too quick to agree.  I remembered Xiaobin's fix to remove such  
casts, but something is not right here.

If I take out the cast, the compile fails on Mac.  And I notice that  
there are similar casts elsewhere, such as in vtableStubs_x86_*.cpp.

For my part, I guess I can avoid the issue by this dodge:
     intptr_t zero = 0;
     __ cmpptr(arg_slots.as_register(), zero);

Not very satisfying.  But I don't want to fight the NULL_WORD battle.

-- John