[jdk11u-dev] RFR: 8295322: Tests for JDK-8271459 were not backported to 11u

[Alexey Pavlyutkin]

Hi!

Here is a portion of tests from [JDK-8271459](https://bugs.openjdk.org/browse/JDK-8271459) adopted to the 11. Original tests were not backported to the 11 because of the fact they use IR test framework that does not exists in the 11.

Verified on amd64/20.04LTS

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Commit messages:
 - 8295322: merge from https://github.com/apavlyutkin/jdk11u-dev into 8295322
 - removing trailing whitespace
 - 8295322: removing trailing whitespace
 - 8295322: adds tests for StringBuilder of negative capacity

Changes: https://git.openjdk.org/jdk11u-dev/pull/1460/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1460&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295322
  Stats: 187 lines in 1 file changed: 187 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1460.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1460/head:pull/1460

PR: https://git.openjdk.org/jdk11u-dev/pull/1460