[Syntax] Parse "repeat-while statement" syntax node

Author: rintaro

lib/Parse/ParseStmt.cpp

@@ -1625,6 +1625,7 @@ ParserResult<Stmt> Parser::parseStmtWhile(LabeledStmtInfo LabelInfo) {
 ///   stmt-repeat:
 ///     (identifier ':')? 'repeat' stmt-brace 'while' expr
 ParserResult<Stmt> Parser::parseStmtRepeat(LabeledStmtInfo labelInfo) {
+  SyntaxContext->setCreateSyntax(SyntaxKind::RepeatWhileStmt);
   SourceLoc repeatLoc = consumeToken(tok::kw_repeat);
 
   ParserStatus status;

test/Syntax/Outputs/round_trip_parse_gen.swift.withkinds

@@ -243,7 +243,9 @@ func statementTests<FunctionSignature><ParameterClause>() </ParameterClause></Fu
   } </CodeBlock></CatchClause><CatchClause>catch <WhereClause>where <BooleanLiteralExpr>false </BooleanLiteralExpr></WhereClause><CodeBlock>{
   } </CodeBlock></CatchClause><CatchClause>catch <ValueBindingPattern>let <IdentifierPattern>e </IdentifierPattern></ValueBindingPattern><WhereClause>where <SequenceExpr><MemberAccessExpr><IdentifierExpr>e</IdentifierExpr>.foo </MemberAccessExpr><BinaryOperatorExpr>== </BinaryOperatorExpr><IdentifierExpr>bar </IdentifierExpr></SequenceExpr></WhereClause><CodeBlock>{
   } </CodeBlock></CatchClause><CatchClause>catch <CodeBlock>{
-  }</CodeBlock></CatchClause></DoStmt><DoStmt>
+  }</CodeBlock></CatchClause></DoStmt><RepeatWhileStmt>
+  repeat <CodeBlock>{ } </CodeBlock>while <BooleanLiteralExpr>true</BooleanLiteralExpr></RepeatWhileStmt><RepeatWhileStmt>
+  LABEL: repeat <CodeBlock>{ } </CodeBlock>while <BooleanLiteralExpr>false</BooleanLiteralExpr></RepeatWhileStmt><DoStmt>
   LABEL: do <CodeBlock>{}</CodeBlock></DoStmt>
   LABEL: switch <IdentifierExpr>foo </IdentifierExpr>{
     case <ExpressionPattern><IntegerLiteralExpr>1</IntegerLiteralExpr></ExpressionPattern>:<FallthroughStmt>

test/Syntax/round_trip_parse_gen.swift

@@ -244,6 +244,8 @@ func statementTests() {
   } catch let e where e.foo == bar {
   } catch {
   }
+  repeat { } while true
+  LABEL: repeat { } while false
   LABEL: do {}
   LABEL: switch foo {
     case 1: