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temporary get rid of ifunc in folly::Range
Summary: See discussion in D638500. valgrind 3.7 contains a bug that makes it hung up (https://bugs.kde.org/show_bug.cgi?id=301204). glibc 2.5.1 doesn't support ifunc. In the future we should conditionally compile ifunc stuff (this is also required to support clang). Test Plan: unittests, ran range_benchmark to confirm there is no significant performance drop, this additional level of indirection adds overhead of ~1ns. tested on CPUs with and without SSE4.2 support. Reviewed By: email@example.com FB internal diff: D687351
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