Removes the method `FlowAnalysis.forwardExpression`, whose job was to
handle expressions that were rewritten during resolution, transferring
`ExpressionInfo` objects that were associated with the old expression
to the new rewritten expression.
Calls to `FlowAnalysis.forwardExpression` are replaced by an
equivalent construct: a call to `FlowAnalysis.getExpressionInfo` and a
call to `FlowAnalysis.setExpressionInfo`.
This change reduces the number of flow analysis methods that need to
interact with the map that associates expressions with
`ExpressionInfo` objects, paving the way for eventually removing that
map entirely.
Change-Id: I6a6a696486ea5bd30a6b2945f827a320fce1588b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/480720
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
Paul Berry
3490443f82