Fix StochasticSwap routing for if blocks with no else (backport #8891) #8893
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If a control-flow block is not required to be entered (such as an "if" with no "else"), then it can't affect the layout in case the branch isn't taken. This failure would have been clearer in a more control-flow-graph view of the circuit, but we don't yet have that, which is how this bug snuck through. The case of "exit layout need not match entry layout" is really the special case for routing, which this commit makes a bit clearer. (cherry picked from commit 35c4b00)
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jakelishman
approved these changes
Oct 13, 2022
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This is an automatic backport of pull request #8891 done by Mergify.
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