Re: [debug-early] fix problem with template parameter packs

[Jason Merrill]

OK, I see the issue.  We're calling debug_abstract_function to build 
debug info for the abstract instance of a function that we already built 
from dwarf2out_early_global_decl.

It occurs to me that the early-dwarf work should make 
debug_abstract_function and most of the DECL_ABSTRACT handling obsolete. 
 All we need to do is set DW_AT_inline during early debug and update it 
during late debug if the function is inlined.

Jason