8141637: Parallelize single threaded heap region iteration during Pre Evacuate Collection Set
Reviewed-by: tschatzl, lkorinth
0xA15A 0xFF3F #SPACING UNDERSCORE
0xA1FE 0x2571 #LT DIAG UP RIGHT TO LOW LEFT
0xA240 0x2572 #LT DIAG UP LEFT TO LOW RIGHTG
0xA2CC 0x5341 #HANGHZOU NUMERAL TEN
0xA2CE 0x5345 #HANGZHOU NUMERAL THIRTY