token: Slightly improve token writer performance
token: Sync TokenWriter with in volt version
llvm: Don't cause asserts in LLVM
vrt: Volt now has CFG
volt: Fix some comments
semantic: Hoist length cast check out of RT.
semantic: Correctly bail in controller with -E.
token: Add doc comment tokens.
ir: Add docComment property to Node.
parser: Attach doc comments to ir nodes when parsing.
visitor: Add simple documentation printing.