[8u] RFA 8214059: Undefined behaviour in ADLC

[Aleksey Shipilev]

Please approve the push of another UB fix to 8u.

  Original Bug:
      URL: https://bugs.openjdk.java.net/browse/JDK-8214059
      Reporter: Severin Gehwolf
      Assignee: Severin Gehwolf
      Priority: P4
      Components: hotspot

  Original Fix:
        12: JDK-8214059, http://hg.openjdk.java.net/jdk/jdk/rev/e017d2f176d0, 73 day(s) ago

  Backports and Forwardports:
       11: 11.0.3, JDK-8215214, http://hg.openjdk.java.net/jdk-updates/jdk11u/rev/9e179e01882d, 58
day(s) ago
         8: MISSING


The patch requires reshuffling, but otherwise applies without problems. The webrev, for the record:
  http://cr.openjdk.java.net/~shade/8214059/webrev.8u.01/

Testing: Linux x86_64 fastdebug, all hotspot jtreg tests (some unrelated failures)

Thanks,
-Aleksey