[jdk8u-dev] RFR: 8072770: [TESTBUG] Some Introspector tests fail with a Java heap bigger than 4GB

[Ao Qi]

The patch applies clean. This backport only includes test changes and fixes the test failure.

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Commit messages:
 - Backport 137f13474383d72a0d2e392bc2f8926ad69d3da6

Changes: https://git.openjdk.org/jdk8u-dev/pull/209/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=209&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8072770
  Stats: 3 lines in 3 files changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/209.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/209/head:pull/209

PR: https://git.openjdk.org/jdk8u-dev/pull/209