[mlir][AsmParser] Fix comment detection in string literals (#174125) The error positioning logic in emitWrongTokenError() would incorrectly identify '//' inside string literals as comment starts when backing up to position diagnostics. For example, a URL like "http://example.com" would cause the error to point at the '://' instead of the end of the line. Add findCommentStart() helper that properly skips '//' occurrences inside string literals by tracking quote state and handling escape sequences.
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