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This PR extends the local variable check from #1039 to also check variables assigned during pattern matching for RCS1031.
Slightly embarrassingly, I didn't check all the ReduceIfNestingAnalysis code paths in #1039 and so I didn't realise that the AnalyzeDataFlow can only handle an argument of type ExpressionSyntax or StatementSyntax. If you pass it anything else then it will throw a run time error. This PR fixes this issue and adds a number of new tests to enforce.
It is currently not trivial to test the Loop / Switch sections of ReduceIfNestingAnalysis.AnalyzeCore via the analyzer as it passes through
ReduceIfNestingOptions.None
. However, I manually removed the guard clause on lines 63 and 90 and confirmed that it was working correctly.