RFR: CODETOOLS-7902936 Stray VM warnings in forked PrintPropertiesMain lead to hard to debug XML parse exception [v3]

[Jason Zaugg]

> - Recover from stray output before the XML prelude
>   - Report the output in the exception otherwise
>   - Silence VM warnings in PrintPropertiesMain when JEP-158 (-Xlog:) is available (JRE 9+)

Jason Zaugg has updated the pull request incrementally with one additional commit since the last revision:

  Use a temporary file to read output of PrintPropertiesMain

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Changes:
  - all: https://git.openjdk.java.net/jmh/pull/41/files
  - new: https://git.openjdk.java.net/jmh/pull/41/files/76042568..436ff1da

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmh&pr=41&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmh&pr=41&range=01-02

  Stats: 103 lines in 3 files changed: 78 ins; 10 del; 15 mod
  Patch: https://git.openjdk.java.net/jmh/pull/41.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh pull/41/head:pull/41

PR: https://git.openjdk.java.net/jmh/pull/41