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

[Vladimir Kozlov]

On Fri, 5 Mar 2021 08:26:30 GMT, Wang Huang <whuang 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.
>
>> 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.

1:40 ratio is good :) Did you try replay file?
Please, file new bug and describe how you reproduced it (without patch).

About these changes. I am fine with them but you need second review for final code.

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

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