RFR: 8284198: Undo JDK-8261137: Optimization of Box nodes in uncommon_trap [v3]

[Wu Yan]

> [JDK-8261137](https://bugs.openjdk.java.net/browse/JDK-8261137) introduced a regression and has been disabled by [JDK-8276112](https://bugs.openjdk.java.net/browse/JDK-8276112). Better to revert the changes of the optimization instead of letting the dead-code decay.
> 
> This reverts [JDK-8261137](https://bugs.openjdk.java.net/browse/JDK-8261137) and [JDK-8264940](https://bugs.openjdk.java.net/browse/JDK-8264940), my tier1 testing on linux-x86 passed.

Wu Yan has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - update
 - Merge branch 'master' into jdk-8284198
 - delete related tests
 - 8284198: Undo JDK-8261137: Optimization of Box nodes in uncommon_trap

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8083/files
  - new: https://git.openjdk.java.net/jdk/pull/8083/files/ddfb7872..f0e0ca4c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8083&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8083&range=01-02

  Stats: 14103 lines in 603 files changed: 9639 ins; 2928 del; 1536 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8083.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8083/head:pull/8083

PR: https://git.openjdk.java.net/jdk/pull/8083