Re: [C++ Patch] PR 15339

[Paolo Carlini <paolo dot carlini at oracle dot com>]

... the below seems better to me:
1- FUNCTION_DECLs and TEMPLATE_DECLs are handled in their own places.
2- When I tweaked default3.C I didn't notice at first the real reason 
for the existing xfail: in such case we didn't give the 
check_default_args diagnostics. Restored in the below.
3- By handling TEMPLATE_DECLs separately, we can give the 
check_redeclaration_no_default_args permerror and the check_default_args 
error in a consistent order, that is the former before the latter, which 
makes most sense to me (also matches the clang order).

Thanks!
Paolo.

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