RFR: JDK-8293410: assert(ptr != top()) failed: top should go hand-in-hand with stopped

[Damon Fenacci]

The JVM crashes with an assertion failure when array range checks are disabled using `-XX:-GenerateRangeChecks` and we're trying to access the array with an index outside its boundaries.

Such a behaviour is actually expected. What is unclear is the reason for having a _GenerateRangeChecks_ flag (basically to force not to perform range checks). An inspection of the change that introduced the flag didn't clarify its original use-case.

So, removing the `GenerateRangeChecks` flag.

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Commit messages:
 - JDK-8293410: assert(ptr != top()) failed: top should go hand-in-hand with stopped

Changes: https://git.openjdk.org/jdk/pull/11964/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11964&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293410
  Stats: 9 lines in 3 files changed: 0 ins; 3 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/11964.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11964/head:pull/11964

PR: https://git.openjdk.org/jdk/pull/11964