Commits on Feb 1, 2021

1. Fix a memory leak with command modules …

   This commit fixes a memory leak that can happen with `Linker::module`
   when the provided module is a command. This function creates a closure
   but the closure closed over a strong reference to `Store` (and
   transitively through any imports provided). Unfortunately a `Store`
   keeps everything alive, including `Func`, so this meant that `Store` was
   inserted into a cycle which caused the leak.
   
   The cycle here is manually broken by closing over the raw value of each
   external value rather than the external value itself (which has a
   strong reference to `Store`).

   

   alexcrichton committed Feb 1, 2021
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