RFR: 8261137: Optimization of Box nodes in uncommon_trap [v6]

[Wang Huang]

On Thu, 4 Mar 2021 18:19:40 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> I attached hs_err and replay files to [8261137](https://bugs.openjdk.java.net/browse/JDK-8261137).
> It happens only once. Only on aarch64.

* Good News :  

    * I have reproducted this error on my machine. 
    *  I reverted my commit and could also reproduct this error.  It seems that this error has nothing to do with my commit.

* Bad News:
  *   I have not found the reason. 
  *   It seems that this error is a random bug.  I could reproduct this error for one time in 40 tests.

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PR: https://git.openjdk.java.net/jdk/pull/2401