C++ PATCH to fix [[noreturn]]

[Jason Merrill]

I got a note yesterday from someone trying out GCC 4.8 that noted that 
the compiler gave the "attribute ignored" warning for all their uses of 
[[noreturn]], which is one of the attributes described in the standard. 
  Fixing this was a simple matter of mapping it onto the GNU noreturn 
attribute, which has the same semantics.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.8.
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