RFR: 8359104: gc/TestAlwaysPreTouchBehavior.java#<gcname> fails on Linux

[Andreas Steiner]

Get accurate RSS, from smaps_rollup if available(Linux >= 4.14), because the RSS from status is inaccurate especially on systems with more than 32 CPUs.

Not sure if all the additional meminfos like the Pss, Pss_dirty, Pss_Anon, Pss_File, Pss_Shmem, Swap and SwapPss are really needed too. But can be perhaps helpful too.

As the inaccurate memory infos are still used in other methods:
- [print_process_memory_info()](https://github.com/openjdk/jdk/blob/385c13298932f1de16e6161652be35d966d822ec/src/hotspot/os/linux/os_linux.cpp#L2393)
- [jfr_report_memory_info()](https://github.com/openjdk/jdk/blob/385c13298932f1de16e6161652be35d966d822ec/src/hotspot/os/linux/os_linux.cpp#L2686)
- [trim_native_heap()](https://github.com/openjdk/jdk/blob/385c13298932f1de16e6161652be35d966d822ec/src/hotspot/os/linux/os_linux.cpp#L5376)

one can think about to use the accurate values there too.

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Commit messages:
 - add accurate rss

Changes: https://git.openjdk.org/jdk/pull/27192/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27192&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359104
  Stats: 59 lines in 3 files changed: 55 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27192.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27192/head:pull/27192

PR: https://git.openjdk.org/jdk/pull/27192