[C++ Patch] PR 15867

[Paolo Carlini]

Hi,

another old PR, about -Wredundant-decls (not in -Wall, nor in -Wextra, 
thus safe bootstrap-wise).

The issue is that we are emitting a bogus warning for a declaration 
followed by a specialization. The fix seems easy, just check ! 
DECL_TEMPLATE_SPECIALIZATION on newdecl; then however, don't miss 
redundant declarations for the specialization itself, thus the OR with 
DECL_TEMPLATE_SPECIALIZATION on olddecl. The testcase checks both 
situations.

Tested x86_64-linux.

Thanks,
Paolo.

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