RFR: JDK-8312525: New test runtime/os/TestTrimNative.java#trimNative is failing: did not see the expected RSS reduction [v2]

[Thomas Stuefe]

> The test causes intermittent rare errors, so far only seen on Oracle 7.9 with glibc 2.17.  
> 
> This PR disables, for automated testing, the RSS evaluation part of the test. It retains the mechanical part (testing whether trims happen at all, in the expected number). The stricter variant of the test is kept as manual tests (usable with jtreg without -a).

Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:

  Revert part of logging

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14984/files
  - new: https://git.openjdk.org/jdk/pull/14984/files/28537f24..67528a54

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14984&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14984&range=00-01

  Stats: 18 lines in 3 files changed: 0 ins; 16 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14984.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14984/head:pull/14984

PR: https://git.openjdk.org/jdk/pull/14984