RFR (XS): 8218192: Remove copy constructor for MemRegion

[Man Cao]

Hi all,

Could I have reviews for this small patch?
Webrev: https://cr.openjdk.java.net/~manc/8218192/webrev.00/
RFE: https://bugs.openjdk.java.net/browse/JDK-8218192

This will improve G1 write barrier performance for jython in DaCapo, when
building HotSpot with LLVM. More Background and performance numbers are
included in the JBS.

Thanks,
Man
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