C++ PATCH to fix crash building libstdc++ with -fabi-version=1

[Jason Merrill]

I tried building libstdc++ with -fabi-version=1 -Wabi to see what 
warnings it would produce, and it crashed on atomic.cc trying to mangle 
a SCOPE_REF where op 1 is an IDENTIFIER_NODE rather than the DECL that 
the code expected.

Tested x86_64-pc-linux-gnu, applied to trunk.
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