swift

7cd8e35c - [Parse] Parse `send` call expressions behind the `SendCalls` feature

[Parse] Parse `send` call expressions behind the `SendCalls` feature Add the experimental `SendCalls` feature and the `SendExpr` AST node, and parse `send <call>` in the C++ parser and in ASTGen. `send` is a contextual keyword, recognized only when it is followed on the same line by an identifier, `self` or a `$` identifier; the type checker rejects `send` calls for now.