[Syntax] Parse attributed types in expr position as TypeExprSyntax

rdar://problem/70101520
https://bugs.swift.org/browse/SR-13711

Author: rintaro

lib/Parse/ParseExpr.cpp

@@ -421,6 +421,7 @@ ParserResult<Expr> Parser::parseExprSequenceElement(Diag<> message,
       isType = canParseType();
     }
     if (isType) {
+      SyntaxParsingContext TyExprCtx(SyntaxContext, SyntaxKind::TypeExpr);
       ParserResult<TypeRepr> ty = parseType();
       if (ty.isNonNull())
         return makeParserResult(

test/Syntax/Outputs/round_trip_parse_gen.swift.withkinds

@@ -73,6 +73,7 @@ class C <MemberDeclBlock>{<MemberDeclListItem><FunctionDecl>
 
   func foo3<FunctionSignature><ParameterClause>() </ParameterClause></FunctionSignature><CodeBlock>{<SequenceExpr><DiscardAssignmentExpr>
     _ </DiscardAssignmentExpr><AssignmentExpr>= </AssignmentExpr><FunctionCallExpr><ArrayExpr>[<ArrayElement><TypeExpr><SimpleTypeIdentifier>Any</SimpleTypeIdentifier></TypeExpr></ArrayElement>]</ArrayExpr>()</FunctionCallExpr></SequenceExpr><SequenceExpr><DiscardAssignmentExpr>
+    _ </DiscardAssignmentExpr><AssignmentExpr>= </AssignmentExpr><MemberAccessExpr><TupleExpr>(<TupleExprElement><TypeExpr><AttributedType><Attribute>@convention(c) </Attribute><FunctionType>(<TupleTypeElement><SimpleTypeIdentifier>Int</SimpleTypeIdentifier></TupleTypeElement>) -> <SimpleTypeIdentifier>Void</SimpleTypeIdentifier></FunctionType></AttributedType></TypeExpr></TupleExprElement>)</TupleExpr>.self</MemberAccessExpr></SequenceExpr><SequenceExpr><DiscardAssignmentExpr>
     _ </DiscardAssignmentExpr><AssignmentExpr>= </AssignmentExpr><MemberAccessExpr><MemberAccessExpr><IdentifierExpr>a</IdentifierExpr>.a</MemberAccessExpr>.a</MemberAccessExpr></SequenceExpr><SequenceExpr><DiscardAssignmentExpr>
     _ </DiscardAssignmentExpr><AssignmentExpr>= </AssignmentExpr><MemberAccessExpr><IdentifierExpr>a</IdentifierExpr>.b</MemberAccessExpr></SequenceExpr><SequenceExpr><DiscardAssignmentExpr>
     _ </DiscardAssignmentExpr><AssignmentExpr>= </AssignmentExpr><MemberAccessExpr><IntegerLiteralExpr>1</IntegerLiteralExpr>.a</MemberAccessExpr></SequenceExpr><MemberAccessExpr><MemberAccessExpr><MemberAccessExpr><TupleExpr>

test/Syntax/round_trip_parse_gen.swift

@@ -73,6 +73,7 @@ class C {
 
   func foo3() {
     _ = [Any]()
+    _ = (@convention(c) (Int) -> Void).self
     _ = a.a.a
     _ = a.b
     _ = 1.a