RFR: 8255973: Add more logging to debug JDK-8255917 [v3]

[Yumin Qi]

> Hi, Please review
> 
>   JDK-8255917 failed on not finding the committed region from the _reserved_regions list when try to add the region to the committed list. It looks like possible the region was released without logged. 
>   Added a log tag for tracing Native Memory Tracking (NMT) add/remove recorded info. This could help us to identify the problem for NMT or the code behind NMT. Function pd_attempt_reserve_memory_at could fail, but no message logged, so added a logging for its failure. 
> 
> Tests: tier1-4, local jtreg.

Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:

  Make nmt log at debug level, and attempt_reserve_memory_at failed log to os+metaspace debug level

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1150/files
  - new: https://git.openjdk.java.net/jdk/pull/1150/files/fd827f0c..67082078

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1150&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1150&range=01-02

  Stats: 17 lines in 3 files changed: 3 ins; 0 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1150.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1150/head:pull/1150

PR: https://git.openjdk.java.net/jdk/pull/1150