kStringLiteralFlag  371 src/preparser.h kStringLiteralFlag = 2,  // Used to detect directive prologue.
kStringLiteralFlag  372 src/preparser.h kUnknownStringLiteral = kStringLiteralFlag,
kStringLiteralFlag  373 src/preparser.h kUseStrictString = kStringLiteralFlag | 8,