Commits on Dec 23, 2023

1. lowering: Optimize lowering of tryfinally with trivial finally block …

   This optimizes the lowering of a tryfinally block with empty finally
   block to instead use the try/catch lowering, where the catch block
   is given as simply `rethrow()`. This is equivalent semantically to
   try/finally in this case, but the code structure is a lot simpler
   with fewer basic blocks and without the auxiliary slot for tracking
   the finally slot. The motivation here is to help the compiler optimize
   better when using the `@with` macro, which has an empty `finally` block
   (but uses the scope argument of 'tryfinally).

   

   Keno committed Dec 23, 2023
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