RFR: 8349003: NativeCallStack::print_on() output is unreadable [v2]

[Zhengyu Gu]

> Please review this trivial change that improves output readability.

Zhengyu Gu has updated the pull request incrementally with one additional commit since the last revision:

  David's comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23359/files
  - new: https://git.openjdk.org/jdk/pull/23359/files/2cd05aea..4467820a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23359&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23359&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23359.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23359/head:pull/23359

PR: https://git.openjdk.org/jdk/pull/23359