Commits on Sep 20, 2021

1. [mono][wasm] Rework the handling of GC references in AOTed code. …

   Previously, variables holding GC refs were marked volatile so they
   were loaded/stored to the C stack on every access. Since the stack
   is conservatively scanned, all the objects pointed to by it are pinned,
   so there is no need to load them on every access. Instead of
   marking them as volatile, allocate a 'gc pinning' area on the stack,
   and store ref variables to it after they are assigned. This improves
   code size and performance.

   

   vargaz committed Sep 20, 2021
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