Fixing issue #773#774
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…cks until after statements are executed
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Moving check of out-edge condition well-definedness for loop head blocks until after the block's statements are executed.
The current code works if loop head blocks do not contain statements, which I guess is true for while loops, but not necessarily for goto-loops. The out-edge conditions must be well-defined in the state after the block statements have been executed, not before.
This fixes issue #773.