RFR: 8244801 - Code duplication in ReservedSpace::initialize/ReservedHeapSpace::try_reserve_heap

[Cesar Soares Lucas]

Bug: https://bugs.openjdk.java.net/browse/JDK-8244801
Webrev: https://cr.openjdk.java.net/~adityam/cesar/8244801/0/
Need sponsor: Yes

Can you please review the above linked patch for the mentioned bug? 
It's a small change that refactor a portion of duplicated code in `virtualspace.cpp`. 

I tried to structure the code so that the new code and the old printed the same 
log messages. Please let me know if you want to simplify the method signature 
and just hard code the log message. I also tried to come up with a short yet 
descriptive name for the method; let me know if you have suggestions on that 
as well.


Thanks,
Cesar
Software Engineer - Microsoft