Commits on May 1, 2021

1. Report coverage 0 of dead blocks …

   Fixes: rust-lang#84018
   
   With `-Z instrument-coverage`, coverage reporting of dead blocks
   (for example, blocks dropped because a conditional branch is dropped,
   based on const evaluation) is now supported.
   
   If `instrument-coverage` is enabled, `simplify::remove_dead_blocks()`
   finds all dropped coverage `Statement`s and adds their `code_region`s as
   `Unreachable` coverage `Statement`s to the `START_BLOCK`, so they are
   still included in the coverage map.
   
   Check out the resulting changes in the test coverage reports in this PR.

   

   richkadel committed May 1, 2021
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