fix -Wunused-variable
Summary: Exposed by the latest clang: ```lang=bash folly/test/FixedStringTest.cpp:52:36: error: unused variable 's' [-Werror,-Wunused-variable] constexpr folly::FixedString<42> s{"hello world"}; ^ folly/gen/test/StringBenchmark.cpp:176:15: error: unused variable 'line' [-Werror,-Wunused-variable] StringPiece line(kLine); ^ ``` Reviewed By: yfeldblum Differential Revision: D6264853 fbshipit-source-id: 5cf4b0a8c99eaa31c2499746c70ddc49fdd73074
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