Exclude compiler-generated code from coverage analysis

[sharwell]

No description provided.

[codecov-io]

Current coverage is 87.16%

Merging #1546 into master will increase coverage by +9.88% as of 2150137

@@            master   #1546   diff @@
======================================
  Files          530     460      -70
  Stmts        32148   15024   -17124
  Branches      8794    1890    -6904
  Methods          0       0         
======================================
- Hit          24844   13095   -11749
+ Partial       5135     706    -4429
+ Missed        2169    1223     -946

Review entire Coverage Diff as of 2150137

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[pdelvo]

👍

[sharwell]

I'm not so sure this is what we want. The goal was to exclude the unreachable portions of the state machine generated for async methods, but it turned out to completely exclude all async methods as well as iterator blocks. I'm not sure what the right approach is yet.