thrift: frozen: silence deluge of -Wunused-variable for variable used in assert()
thrift: frozen: silence deluge of -Wunused-variable for variable used in assert()

Summary: @meyering: is there a "better" way to silence this for a single variable?

Test Plan: buck build unicorn/...

Reviewed By: yfeldblum@fb.com, tjackson@fb.com

Subscribers: trunkagent, alandau, yfeldblum, meyering, tudort

FB internal diff: D2603869

Signature: t1:2603869:1446260959:ba9538219dca1ffc33d569bd56013534a9af7727

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