RFR: 8329807: Shenandoah: Temporarily revert JDK-8324655

[William Kemper]

No longer seeing crashes locally after backing this change out.

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Commit messages:
 - Revert "8324655: Identify integer minimum and maximum patterns created with if statements"

Changes: https://git.openjdk.org/shenandoah/pull/419/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah&pr=419&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329807
  Stats: 708 lines in 7 files changed: 0 ins; 704 del; 4 mod
  Patch: https://git.openjdk.org/shenandoah/pull/419.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/419/head:pull/419

PR: https://git.openjdk.org/shenandoah/pull/419