Backporting to 4_0 the latest friend bits

[Kriang Lerdsuwanakij]

Mark Mitchell wrote:

>
> OK.  Do you happen to have access to any other testsuites, beyond the 
> GCC testsuite?  If so, it would be great to validate the behavior of 
> the compiler on the 4.0 branch with and without your patch to make 
> sure that we're not doing any harm. 

I am sorry I don't have it.

--Kriang