[jdk11u-dev] RFR: 8269280: (bf) Replace StringBuffer in *Buffer.toString()

[Sonia Zaldana Calles]

8269280: (bf) Replace StringBuffer in *Buffer.toString()

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Commit messages:
 - Backport 3a8f3d6cac0ab859704db533bf1f63431fbd9253

Changes: https://git.openjdk.org/jdk11u-dev/pull/2231/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2231&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8269280
  Stats: 654 lines in 9 files changed: 638 ins; 5 del; 11 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2231.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2231/head:pull/2231

PR: https://git.openjdk.org/jdk11u-dev/pull/2231