Commits on Aug 17, 2018

1. Fix reinterpret performance …

   This fixes #25014 by making it more obvious what's going on to LLVM.
   Instead of a memcpy loop, we use a ccall to :memcpy and turn this into
   llvm.memcpy at the IR level, which is enough for LLVM to fold everything
   away. In the benchmark from #25014, we still see some regressions from
   0.6, but that is because it needs to dereference through the pointers
   in the reinterpret and reshape wrappers. In any real code, that
   dereferencing should be loop-invariantly moved out of the inner loop.

   

   Keno committed Aug 17, 2018
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