RFR: 8257190: simplify PhaseIdealLoop constructors [v2]

[Xin Liu]

On Tue, 1 Dec 2020 07:34:25 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Xin Liu 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 three additional commits since the last revision:
>> 
>>  - Merge branch 'master' into JDK-8257190
>>  - 8257190: simplify PhaseIdealLoop constructors
>>    
>>    update the comments of the verify constructors.
>>  - 8257190: simplify PhaseIdealLoop constructors
>
> Looks good, thanks for updating.

hi, @TobiHartmann , 

Thank you! Could you sponsor this change? 
The failed test runtime/handshake/HandshakeWalkStackTest.java is a flaky test, which is irrelevant to PR.

thanks,
--lx

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PR: https://git.openjdk.java.net/jdk/pull/1473