RFR: JDK-8293978: Duplicate simple loop back-edge will crash the vm [v3]

[王超]

> Duplicate back-edge of the following simple loop will make jvm crash.
> 
> <img width="458" alt="image" src="https://user-images.githubusercontent.com/25214855/190945327-ebce5342-bede-4fad-b940-088753034fa6.png">

王超 has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Move the condition ahead

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10329/files
  - new: https://git.openjdk.org/jdk/pull/10329/files/63fd328e..474bbeba

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10329&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10329&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10329.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10329/head:pull/10329

PR: https://git.openjdk.org/jdk/pull/10329