RFR: 8281946: VM.native_memory should report size of shareable memory [v2]

[Matias Saavedra Silva]

> The native memory reporting has been improved to also include the amount of shareable (read only) data. Verified with test tiers 1,2, and 4.

Matias Saavedra Silva has updated the pull request incrementally with one additional commit since the last revision:

  Assert should now pass on windows

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11401/files
  - new: https://git.openjdk.org/jdk/pull/11401/files/aeb58021..bb4c3417

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11401&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11401&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11401.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11401/head:pull/11401

PR: https://git.openjdk.org/jdk/pull/11401