[jdk11u-dev] RFR: 8253872: ArgumentHandler must use the same delimiters as in jvmti_tools.cpp

[Goetz Lindenmaier]

I backport this for parity with 11.0.16-oracle.

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Commit messages:
 - Backport 4b16f8ab942b08b249abfe6f95c4ded3ef139ef0

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/961/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=961&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253872
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/961.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/961/head:pull/961

PR: https://git.openjdk.java.net/jdk11u-dev/pull/961