Commits on Apr 14, 2019

1. Partly mitigate bad Clang inlining decision …

   Because a visitor is wrapped several times during visitation it cases extra
   temporaries usage and useless store and loads that can only be optimized if
   the `visitation_impl` is inlined into the function that creates the wrapper.
   Clang inliner decides not to inline functions even with small-sized switches,
   resulting in a poor visitation code. Forceinline mark on those internal functions perceptibly improves the situation, though does not mitigate it
   completely.
   
   LLVM ticket https://bugs.llvm.org/show_bug.cgi?id=41491

   

   Kojoley committed Apr 14, 2019
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