perform sourceExpr translation on match-bang expressions #9407
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This fixes #9406 by introducing sourceExpr rewriting for match! expressions.
I tested this locally using
dotnet run -f netcoreapp3.0 -- --langversion:preview /Users/chethusk/oss/scratch/match.fsx
from the FSI directory and using the same failing fsx file from the issue report. I could use advice on how/where to add tests for this though. I imagine we'd need a miniature CE in the test suite to trigger this instead of bringing in an entire dependency.