Regression: SyntaxFactory.UsingDirective overload always throws

[GrahamTheCoder]

Version Used:
Version 17.7.0 Preview 2.0

Steps to Reproduce:

1. Call Microsoft.CodeAnalysis.CSharp.SyntaxFactory.UsingDirective(SyntaxToken staticKeyword, NameEqualsSyntax alias, NameSyntax name) with any valid parameters
2. throws ArgumentException("usingKeyword")

Expected Behavior:
As previously: Construct and pass a valid Token(usingKeyword)

Actual Behavior:
Constructs and passes a default(SyntaxToken) which causes the called code to always throw

Other details

The bug is here:

roslyn/src/Compilers/CSharp/Portable/Syntax/UsingDirectiveSyntax.cs

Line 38 in d0f4099

=> UsingDirective(globalKeyword: default, usingKeyword: default, staticKeyword, unsafeKeyword: default, alias, namespaceOrType: name, semicolonToken: default);

It passes through default, to an overload that in the generated syntax factory that throws unless the syntax kind of that parameter is SyntaxKind.UsingKeyword

The code was added in: c8d3925#diff-95477edd7a2f9bf55ac156fbeb22d71f973b06dc20a7034b373e8c2e8341d6f0

Bug originally reported here: icsharpcode/CodeConverter#1019
Unit test would probably go in Microsoft.CodeAnalysis.CSharp.UnitTests.SyntaxFactoryTests and look something like:

        [Fact]
        public void UsingDirective()
        {
            var someValidName = SyntaxFactory.ParseName("System.String");
            var usingDirective = SyntaxFactory.UsingDirective(SyntaxFactory.Token(SyntaxKind.StaticKeyword), default(NameEqualsSyntax), someValidName);
            Assert.Equal("using static System.String;", usingDirective.ToString());
        }

[jcouv update:] Relates to test plan #56323

[CyrusNajmabadi]

@GrahamTheCoder def feel free to submit a fix too. It will help expedite things!