[parser] Inline ParseStatemantAsUnlabelled into its only useful caller
Tracking labels for most of these statements made no difference: only try-statements require the special treatment of being wrapped in a block. The previous code existed to support strong mode, which is long gone. This also results in a tiny regression of the error message for a labelled `continue` statement targeting itself, but I'm not convinced that anyone would ever intend to label a continue statement (and Chakra and SpiderMonkey give similarly inaccurate error messages for this case). This is effectively a revert of d8bccfe9. Bug: v8:6092 Change-Id: I25b62e10f6a20597e9686f08df76ba9724249618 Reviewed-on: https://chromium-review.googlesource.com/653380Reviewed-by:Marja Hölttä <marja@chromium.org> Commit-Queue: Adam Klein <adamk@chromium.org> Cr-Commit-Position: refs/heads/master@{#47904}
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