G1: Improve root location reference to dead obj verification message

When during verification there is a root reference to a dead object G1 prints:

Root location 0x00007fc6497f5070 points to dead obj 0x00000000e0200000

but for other references it prints

points to dead obj 0x00000000e0300000 in region 3:(HS)[0x00000000e0300000,0x00000000e0400000,0x00000000e0400000]

I.e. there is additional information at the end of the message about the region# and type that is very interesting to know without needing to look it up.