Add conv_benchmark target to Makefile.am
Add conv_benchmark target to Makefile.am

Summary: It's useful to be able to build & run the benchmark.

Differential Revision: D3433731

fbshipit-source-id: c37bd5be3da0f89d4792747857d2e7548aea08ba

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