AllocateSubString  265 src/factory.cc                      isolate()->heap()->AllocateSubString(*str, begin, end),
AllocateSubString  945 src/heap.h       MUST_USE_RESULT MaybeObject* AllocateSubString(
AllocateSubString 7100 src/objects.cc   MaybeObject* result = heap->AllocateSubString(this, start, end, pretenure);