RFR: 8320836: jtreg gtest runs should limit heap size [v2]

[Thomas Stuefe]

> Trivial fix to limit Java heap size when running the gtests. Otherwise, we run with an unknown malloc load (since GC structures, preallocated, may be very large), and not all tests like that.

Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:

  copyrights

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26454/files
  - new: https://git.openjdk.org/jdk/pull/26454/files/65ae1a5c..9d3ab31f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26454&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26454&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26454.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26454/head:pull/26454

PR: https://git.openjdk.org/jdk/pull/26454