[Patch] libstdc++/24692

[Paolo Carlini]

Hi,

given the clean up, the minimal fix for this PR is very simple: when 
safe, the builtins are available, inline the calls (but keep on 
providing out of line __exchange_and_add and __atomic_add for binary 
compatibility). Tested x86/ia64-linux, will wait until monday in case 
I'm missing pitfalls...

Paolo.

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