RFR: 8268425: Show decimal nid of OSThread instead of hex format one [v2]

[Yi Yang]

> From users' perspective, we can find corresponding os thread via top directly, otherwise, we must convert hex format based nid to an integer, and find that thread via `top -pid <pid>`. This slightly facilitates our debugging process, but would obviously break some existing jstack analysis tool.
> 
> Jstack Before:
> 
> "ParGC Thread#7" os_prio=0 cpu=103260.18ms elapsed=5255043.58s tid=0x00007f967000b000 nid=0x12e67 runnable
> 
> "ParGC Thread#8" os_prio=0 cpu=104818.76ms elapsed=5255043.58s tid=0x00007f967000c000 nid=0x12e68 runnable
> 
> "ParGC Thread#9" os_prio=0 cpu=102164.69ms elapsed=5255043.58s tid=0x00007f967000e000 nid=0x12e69 runnable
> 
> Jstack After:
> "G1 Conc#0" os_prio=0 cpu=0.03ms elapsed=1295.27s tid=0x00007f99dc096490 nid=117707 runnable
> 
> "G1 Refine#0" os_prio=0 cpu=0.06ms elapsed=1295.22s tid=0x00007f99dc2cad20 nid=117708 runnable
> 
> "G1 Service" os_prio=0 cpu=87.05ms elapsed=1295.22s tid=0x00007f99dc2cc140 nid=117709 runnable
> 
> Top:
>    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>  49083 tianxia+ 20 0 32.8g 594148 10796 S 103.3 0.1 0:10.05 java
>  71291 qingfen+ 20 0 39.3g 26.7g 18312 S 100.7 5.3 16861:35 jhsdb
>  50407 tianxia+ 20 0 32.5g 32796 9768 S 100.3 0.0 0:05.80 java
> 107429 maolian+ 20 0 11.4g 1.1g 10956 S 100.3 0.2 20173:52 java
>  99923 root 10 -10 288520 163228 5088 S 5.9 0.0 6463:53 AliYunDun

Yi Yang has updated the pull request incrementally with one additional commit since the last revision:

  restore cleanup code

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4449/files
  - new: https://git.openjdk.java.net/jdk/pull/4449/files/eb469267..4baeb175

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4449&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4449&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4449.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4449/head:pull/4449

PR: https://git.openjdk.java.net/jdk/pull/4449