RFR: JDK-8322512 StringBuffer.repeat does not work correctly after toString() was called [v2]

[Jim Laskey]

> The new repeat methods were not clearing the toStringCache.

Jim Laskey has updated the pull request incrementally with one additional commit since the last revision:

  Clear sooner

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17172/files
  - new: https://git.openjdk.org/jdk/pull/17172/files/82b7e342..66eb7f71

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17172&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17172&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17172.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17172/head:pull/17172

PR: https://git.openjdk.org/jdk/pull/17172