try fixing/optimizing x86_64 fenv exception code
authorRich Felker <dalias@aerifal.cx>
Sun, 18 Mar 2012 00:10:02 +0000 (20:10 -0400)
committerRich Felker <dalias@aerifal.cx>
Sun, 18 Mar 2012 00:10:02 +0000 (20:10 -0400)
untested; may need followup-fixes.


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