Fix compilation of `integer-gmp2` with `-O0`
At optimization level `-O0` `wordToInteger` wasn't inlined, and this caused a `__integer` literal to turn up in final Core, which would trigger the GHC panic ghc-stage1: panic! (the 'impossible' happened) (GHC version 7.9.20141114 for x86_64-unknown-linux): Can't use Integer in integer-* By forcing inlining via `inline` this is avoided. This should hopefully address #9800.
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