[11u] RFR: JDK-8251255: [linux] Add process-memory information to hs-err and VM.info

[Thomas Stüfe]

Hi,

may I have reviews for this small backport please. Its goal is to add some
beneficial information to the hs-err file (process virtual size and
resident set size).

The original patch applies unmodified, but only with --fuzz=3, since the
surroundings changed too much.

Original issue: https://bugs.openjdk.java.net/browse/JDK-8251255
Original patch: https://hg.openjdk.java.net/jdk/jdk/rev/a6bd3cd0c3a2
Modified patch:
http://cr.openjdk.java.net/~stuefe/webrevs/backports/8251255-linux-add-process-memory-info-to-hserr-modified-for-11.patch

Thanks, Thomas