Commits on Jul 18, 2018

1. rustc: Work around an upstream wasm ThinLTO bug …

   This commit implements a workaround for an [upstream LLVM bug][1] where custom
   sections were accidentally duplicated amongst codegen units when ThinLTO passes
   were performed. This is due to the fact that custom sections for wasm are stored
   as metadata nodes which are automatically imported into modules when ThinLTO
   happens. The fix here is to forcibly delete the metadata node from imported
   modules before LLVM has a chance to try to copy it over.
   
   [1]: https://bugs.llvm.org/show_bug.cgi?id=38184

   

   alexcrichton committed Jul 18, 2018
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