fix(parser): support HTML close comment on first line - #5518
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Fixes #5375. Annex B allows an HTML close comment (
-->) at the start of the source code. The lexer did not treat the start of the file identically to aLineTerminatorsequence, resulting in aSyntaxError. This PR updates the buffered lexer to check if the previous token is missing (which occurs at the start of parsing) and handles skipping-->correctly in that case.