Fix for a flashcache_create bug where associativity is not being passed in correctly.

Summary: Fix for a flashcache_create bug where associativity is not being passed in
correctly to the flashcache module.

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added 3.9.0 support
Merge pull request #120 from avirus/patch-1

added 3.9.0 support
Merge branch 'master' of github.com:facebook/flashcache
Fix a compilation error caused by a missing '#' in the commit for 3.9.0 support.

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