Commits on Jun 3, 2018

1. Optimize logging codegen …

   The extra work involved in loading the logger and creating the record
   struct involves move codegen than is necessary if we take this kind of
   approach (which we previously used in 0.3). It's a bit unfortunate to
   have these public-but-not-public functions, but I think it's worth it.
   We want to minimize the footprint of logging so people feel comfortable
   using it!
   
   A main function containing nothing but `warn!("hello world")` shrinks
   from 204 bytes to 124 bytes in x86_64 with this change.
   
   Closes rust-lang#275

   

   sfackler committed Jun 3, 2018
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