I was looking at the tokenizer specifically fn testTokenize and the
this statement looked odd:

  if (@TagType(Token.Id)(token.id) != @TagType(Token.Id)(expected_token_id)) {

I then saw the TODO and thought I'd remove StrLitKind figuring that
would make testTokenize simpler. It did so I thought I'd prepare this PR.

The tests are still working and stage2 zig seems to work, it compiles and
I was able to use the fmt command.