[jdk17u-dev] RFR: 8247980: Exclusive execution of java/util/stream tests slows down tier1

[Aleksey Shipilev]

Clean backport to improve 17u testing. There seem to be no bugtail from the mainline improvement pushed back in September 2020.

Additional testing:
 - [x] Linux x86_64 fastdebug `jdk:tier1`

Motivational improvements on TR 3970X:


# Before
real	14m48.189s
user	425m10.750s
sys	17m11.072s

# After
real	9m21.856s
user	417m29.605s
sys	15m27.971s

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

Commit messages:
 - Backport 544193a3bb6431ee4bb0bd43cb29cc60c7709b25

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/22/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=22&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247980
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/22.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/22/head:pull/22

PR: https://git.openjdk.java.net/jdk17u-dev/pull/22