avoid aggressive optimization
avoid aggressive optimization

Summary: GCC will now dead-code eliminate the folly-based version of this test without a mechanisms to force the result to be live.

Reviewed By: ttsugriy

Differential Revision: D2854633

fb-gh-sync-id: 0e3841ed22c040fda7653bcfb5a3f19ca3d1f835

charsyam/folly,facebook/folly,rklabs/folly,charsyam/folly,floxard/folly,facebook/folly,Hincoin/folly,Hincoin/folly,Orvid/folly,Orvid/folly,brunomorishita/folly,floxard/folly,brunomorishita/folly,charsyam/folly,mqeizi/folly,mqeizi/folly,rklabs/folly,Orvid/folly,Hincoin/folly,Hincoin/folly,floxard/folly,brunomorishita/folly,rklabs/folly,rklabs/folly,facebook/folly,floxard/folly,Hincoin/folly,rklabs/folly,brunomorishita/folly,Orvid/folly,facebook/folly,mqeizi/folly,mqeizi/folly,brunomorishita/folly,facebook/folly,floxard/folly,charsyam/folly,Orvid/folly,mqeizi/folly