RFR: 8294397: Replace StringBuffer with StringBuilder within java.text [v4]

[Justin Lu]

> Problem: Unnecessary instances of StringBuffer within java.text (internal only)
> 
> Fix: StringBuffer Replaced with StringBuilder, and adjusted variable/method names

Justin Lu has updated the pull request incrementally with two additional commits since the last revision:

 - Remove comment typo
 - Remove test wrapper

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10475/files
  - new: https://git.openjdk.org/jdk/pull/10475/files/cd966f31..442c2a4e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10475&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10475&range=02-03

  Stats: 45 lines in 3 files changed: 9 ins; 35 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10475.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10475/head:pull/10475

PR: https://git.openjdk.org/jdk/pull/10475