RFR: 8262500: HostName entry in VM.info should be a new line

[Yasumasa Suenaga]

We can get host name from VM.info dcmd (and also hs_err log) on fastdebug build as below. It affects (fast)debug build for Windows only.

--------------- S Y S T E M ---------------

HostName: Xelvis OS:
 Windows 10 , 64 bit Build 19041 (10.0.19041.804)
OS uptime: 1 days 1:33 hours
Hyper-V role detected

`OS` label is available within HostName entry. It should be in a new line.

After this change, we can get VM.info output as below:

---------------  S Y S T E M  ---------------

HostName: Xelvis
OS:
 Windows 10 , 64 bit Build 19041 (10.0.19041.804)
OS uptime: 1 days 1:44 hours
Hyper-V role detected

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

Commit messages:
 - 8262500: HostName entry in VM.info should be a new line

Changes: https://git.openjdk.java.net/jdk/pull/2763/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2763&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262500
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2763.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2763/head:pull/2763

PR: https://git.openjdk.java.net/jdk/pull/2763