RFR: 8269476: Skip nmethod entry barrier if there is no oops in the jit code [v2]

[王超]

On Mon, 28 Jun 2021 09:40:51 GMT, Jie Fu <jiefu at openjdk.org> wrote:

>> 王超 has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Only implement in x86
>
> src/hotspot/cpu/aarch64/gc/shared/barrierSetNMethod_aarch64.cpp line 166:
> 
>> 164: 
>> 165: void BarrierSetNMethod::fix_entry_barrier(nmethod*, bool) {
>> 166:   // not implement yet
> 
> Shall we use `Unimplemented();` here?

refactor to x86 only

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PR: https://git.openjdk.java.net/jdk/pull/4610