RFR: 8286104: use aggressive liveness for unstable_if traps [v7]

[Xin Liu]

On Wed, 1 Jun 2022 19:39:14 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Xin Liu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove useless flag. if jdwp is on, liveness_at_bci() marks all local
>>   variables live.
>
> src/hotspot/share/opto/compile.cpp line 1864:
> 
>> 1862: }
>> 1863: 
>> 1864: void Compile::invalidate_unstable_if(CallStaticJavaNode* unc) {
> 
> Add description comment for this method. What it is used for.

updated it. also rename it to remove_unstable_if().

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PR: https://git.openjdk.java.net/jdk/pull/8545