Commits on Feb 6, 2019

1. Make intern_lazy_const actually intern its argument. …

   Currently it just unconditionally allocates it in the arena.
   
   For a "Clean Check" build of the the `packed-simd` benchmark, this
   change reduces both the `max-rss` and `faults` counts by 59%; it
   slightly (~3%) increases the instruction counts but the `wall-time` is
   unchanged.
   
   For the same builds of a few other benchmarks, `max-rss` and `faults`
   drop by 1--5%, but instruction counts and `wall-time` changes are in the
   noise.
   
   Fixes rust-lang#57432, fixes rust-lang#57829.

   

   nnethercote committed Feb 6, 2019
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