IS_STRING         995 src/hydrogen-instructions.cc   if (check_ == IS_STRING &&
IS_STRING        1029 src/hydrogen-instructions.cc     case IS_STRING:
IS_STRING        1063 src/hydrogen-instructions.cc     case IS_STRING: return "string";
IS_STRING        2182 src/hydrogen-instructions.h     return new(zone) HCheckInstanceType(value, IS_STRING);