Commits on Oct 19, 2017

1. Stop relying on linking details of std’s default allocator …

   We’ve been bitten before by symbol names changing:
   servo/heapsize#46
   and upstream is planning to stop using jemalloc by default:
   rust-lang/rust#33082 (comment)
   
   So use the (relatively) new `#[global_allocator]` attribute
   to explicitly select the system allocator on Windows
   and jemalloc (now in an external crate) on other platforms.
   This choice matches current defaults.

   

   SimonSapin committed Oct 19, 2017

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