Commits on May 16, 2022

1. speedup typechecking of nested if expressions …

   Deeply nested if/else expressions have a worst-case exponential behavior.
   
   This will for instance manifest when returning literal values which cause
   repeated analysis of conditional branches with subtly different type context
   for each literal.
   
   This can be optimized by observing that a simple literal context will yield
   the same analysis as its fallback type, and likewise, two literals of the
   same fallback type will yield the same analysis. In those case we can avoid
   the repeated analysis and prevent the worst-case exponential behavior.
   
   Fixes python#9591

   

   huguesb committed May 16, 2022
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