RFR: 8329163: C2: possible overflow in PhaseIdealLoop::extract_long_range_checks()

[Roland Westrelin]

This change avoids the overflow of `ABS(scale)` when `scale` is `min_jlong`.

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Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/18508/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18508&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329163
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18508.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18508/head:pull/18508

PR: https://git.openjdk.org/jdk/pull/18508