RFR: 8332401: G1: TestFromCardCacheIndex.java with -XX:GCCardSizeInBytes=128 triggers underflow assertion

[Albert Mingkun Yang]

Remove too-strong assert -- heap and bot can be placed in arbitrary addresses, so one doesn't always get lower address than the other.

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Commit messages:
 - bot-delta

Changes: https://git.openjdk.org/jdk/pull/19303/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19303&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332401
  Stats: 6 lines in 3 files changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/19303.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19303/head:pull/19303

PR: https://git.openjdk.org/jdk/pull/19303