RFR: 8315948: JDK-8315818 broke Xcomp on libgraal

[Doug Simon]

On Fri, 8 Sep 2023 18:24:35 GMT, Tom Rodriguez <never at openjdk.org> wrote:

>> This PR fixes a regression caused by [JDK-8315818](https://bugs.openjdk.org/browse/JDK-8315818). Libgraal must not unblock a thread waiting on a blocking compilation, even if libgraal itself is not yet initialized. Initialization of libgraal is not prone to the same initialization deadlocks that jargraal can cause.
>
> src/hotspot/share/compiler/compileBroker.cpp line 1250:
> 
>> 1248:         }
>> 1249:       } else {
>> 1250:         // In libjvmci, JVMCI initialization should not deadlock with other threads
> 
> Can't this comment just go before the guarding if?  An empty else at the every end is harder to connect with the guarding condition.

Done.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15643#discussion_r1320207198