[jdk15u-dev] RFR: 8251257: NMT: jcmd VM.native_memory scale=1 crashes target VM

[Ekaterina Vergizova]

I'd like to backport JDK-8251257 to 15u for parity with 11u.
The patch applies cleanly.
Tested with tier1 and nmt tests.

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Commit messages:
 - Backport 6df465de7309e90bc4de8da66c7059035ffc9bef

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/58/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=58&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251257
  Stats: 9 lines in 2 files changed: 9 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/58.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/58/head:pull/58

PR: https://git.openjdk.java.net/jdk15u-dev/pull/58