RFR: JDK-8316991: Reduce nullable allocation merges [v10]

[Doug Simon]

On Wed, 10 Apr 2024 17:47:36 GMT, Tom Rodriguez <never at openjdk.org> wrote:

>> Cesar Soares Lucas has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Addressing Ivanov's PR feedback.
>
> src/hotspot/share/opto/escape.cpp line 560:
> 
>> 558:       const Type* cast_t = _igvn->type(use);
>> 559:       if (cast_t == nullptr || cast_t->make_ptr()->isa_instptr() == nullptr) {
>> 560:         NOT_PRODUCT(use->dump();)
> 
> This dump should be guarded by TraceReduceAllocationMerges as should the one at line 574

I opened https://bugs.openjdk.org/browse/JDK-8330850 for this.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15825#discussion_r1575229245