Commits on Jul 1, 2020

1. Rewrite a few manual index loops with while-let …

   There were a few instances of this pattern:
   
   ```rust
   while index < vec.len() {
       let item = &vec[index];
       // ...
   }
   ```
   
   These can be indexed at once:
   
   ```rust
   while let Some(item) = vec.get(index) {
       // ...
   }
   ```
   
   Particularly in `ObligationForest::process_obligations`, this mitigates
   a codegen regression found with LLVM 11 (rust-lang#73526).

   

   cuviper committed Jul 1, 2020
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