[C++ PATCH] Fix 23219

[Nathan Sidwell]

Hi,
I've installed this patch to fix 23219.  The problem was we were updating an 
IDENTIFIER_NODE's value & type fields before determining that the template 
declaration was ill-formed.

I also removed some now unreachable code concerning empty stub decls.

booted & tested on i686-pc-linux-gnu, installed on mainline.  I'll install just 
the identifier node changes on 4.0 shortly.

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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