[jdk21u-dev] RFR: 8328822: C2: "negative trip count?" assert failure in profile predicate code

[Aleksey Shipilev]

Simple corner case fix in C2.

Additional testing:
  - [x] New regression test fails without the fix, passes with it
  - [ ] Linux x86_64 server fastdebug, `all`

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Commit messages:
 - Backport 2ceeb6c00135310b7bdabacb92d26d81de525240

Changes: https://git.openjdk.org/jdk21u-dev/pull/497/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=497&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328822
  Stats: 65 lines in 2 files changed: 64 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/497.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/497/head:pull/497

PR: https://git.openjdk.org/jdk21u-dev/pull/497