Commits on Oct 22, 2018

1. Add a cheap mode for compute_missing_ctors. …

   `compute_missing_ctors` is called a lot. It produces a vector, which can
   be reasonably large (e.g. 100+ elements), but the vector is almost
   always only checked for emptiness.
   
   This commit changes `compute_missing_ctors` so it can be called in a
   cheap way that just indicates if the vector would be empty. If
   necessary, the function can subsequently be called in an expensive way
   to compute the full vector.
   
   This change reduces instruction counts for several benchmarks up to 2%.

   

   nnethercote committed Oct 22, 2018
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