[jdk16u] RFR: 8261914: IfNode::fold_compares_helper faces non-canonicalized bool when running JRuby JSON workload

[Aleksey Shipilev]

JDK-8261912 provided the release-mode bailout, and this issue is supposed to fix the corner case in debug-mode.

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Commit messages:
 - Backport 20c93b3b901806cd9d691d75c8f30398c41fec34

Changes: https://git.openjdk.java.net/jdk16u/pull/77/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=77&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261914
  Stats: 10 lines in 1 file changed: 4 ins; 4 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/77.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/77/head:pull/77

PR: https://git.openjdk.java.net/jdk16u/pull/77