CodePageGuardSize  501 src/spaces.cc                           OS::CommitPageSize()) + CodePageGuardSize();
CodePageGuardSize  718 src/spaces.cc    return CodePageGuardStartOffset() + CodePageGuardSize();
CodePageGuardSize  745 src/spaces.cc    size_t area_size = size - CodePageAreaStartOffset() - CodePageGuardSize();
CodePageGuardSize 1035 src/spaces.h     static int CodePageGuardSize();