C++ PATCH for c++/53756 (-g and C++1y auto)

[Jason Merrill]

My earlier work to support return type deduction omitted support for 
debugging information; this patch fixes that oversight.  It also 
corrects the mangled name of 'operator auto', which should reflect the 
'auto' rather than the deduced return type.

Tested x86_64-pc-linux-gnu, applying to trunk.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 53756.patch
Type: text/x-patch
Size: 4571 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20140128/c19cf5c9/attachment.bin>