This adds internal nodes for VariableStatement, VariableDeclaration, Let, and ForStatement. The prepares for separating Variable from InternalVariable and allows for the removal of Variable.asVariableDeclaration.
Change-Id: Ib0593f64b3d22ce99c187ab4af32c8dc8cbea6e9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/509980
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Johnni Winther
ac477b9233