[cfe] Expression compilation renames given variables corresponding to renamed private named parameters
This means that for a constructor like
`C3({required this._x}) : _y = _x + 1;` we will not have `x` in scope,
but we will have `_x` in scope.
This should align the semantics with the normal compilation.
Later CLs might re-introduce `x` as something we _can_ evaluate in
expression compilation if it doesn't shadow other things (e.g. a
top-level method).
This CL opts for letting the scope calculator report the "wrong" name
(i.e. the un-renamed one) to ease matching with the VM and DDC data.
As these renames can only occur in constructors there should be no
possibility for name clashes (i.e. if finding `x` it should be
impossible to also have found `_x` so the rename should be safe).
Bug: https://github.com/dart-lang/sdk/issues/62645
Change-Id: If474fb126759d1073dbbed1a88133fd1e74c8416
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/517421
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
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