Workaround for virtual function/dllimport bug, also patch guidance request

[Jason Merrill]

>>>>> Mumit Khan <khan@nanotech.wisc.edu> writes:

 >>  > Re check_override, I've moved it to grokclassfn, and it looks ok so far.
 >>  > Note that I haven't removed it from finish_struct_1 since I'm not sure
 >>  > where else it needs to be added, other than the current one in 
 >>  > add_implicitly_declared_members.
 >> 
 >> Please try removing it from everywhere but grokclassfn and see how that
 >> works.

 > Are you sure? Removing it from add_implicitly_declared_members will not
 > do the right thing, right?

No, that should be fine; a_i_d_m will hit the call in grokclassfn.

Jason