[11u] RFR: 8229345: Memory leak due to vtable stubs not being shared on SPARC

[Lindenmaier, Goetz]

Hi,

I would like to downport this for parity with 11.0.7-oracle.
I only had to do trivial resolves.
Flag can be removed also in 11 as it's only a debug flag.

http://cr.openjdk.java.net/~goetz/wr19/8229345-vtable_stub_SPARC-jdk11/01/

https://bugs.openjdk.java.net/browse/JDK-8229345
https://hg.openjdk.java.net/jdk/jdk/rev/0a8407a78a2f

Best regards,
  Goetz.