[jdk11u-dev] RFR: 8260934: java/lang/StringBuilder/HugeCapacity.java fails without Compact Strings

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

I had to resolve because  "8218227: StringBuilder/StringBuffer constructor throws confusing NegativeArraySizeException"
is not in 11.
I took over the -Xms5g from that change.

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Commit messages:
 - Backport ad54d8dd832b22485d7ac45958cc4c9bfd70fbd2

Changes: https://git.openjdk.org/jdk11u-dev/pull/1985/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1985&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8260934
  Stats: 12 lines in 1 file changed: 7 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1985.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1985/head:pull/1985

PR: https://git.openjdk.org/jdk11u-dev/pull/1985