Add support for BinaryExpression to the wolf analysis prototype. The AST-to-IR conversion stage now fully handles the BinaryExpression AST node. Most binary expressions are handled by invoking a user-definable operator. `==` and `!=` (which were implemented in a previous CL) are handled through the `eq` instruction. Shortcutting operations `&&`, `||`, and `??` are handled with flow control. Also added support for compound assignments (`op=`) and if-null assignments (`??=`). Change-Id: I90623c4175bf20c77016409da5e503ab74408f6c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/337080 Reviewed-by: Phil Quitslund <pquitslund@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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