[jdk17u-dev] RFR: 8299962: Speed up compiler/intrinsics/unsafe/DirectByteBufferTest.java and HeapByteBufferTest.java

[Goetz Lindenmaier]

I backport this for parity with 17.0.8-oracle.

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Commit messages:
 - Backport 7c1ebcc4ce74bb06f7c911e59a86bcfb5c5da844

Changes: https://git.openjdk.org/jdk17u-dev/pull/1430/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1430&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299962
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1430.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1430/head:pull/1430

PR: https://git.openjdk.org/jdk17u-dev/pull/1430