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

[Tom Rodriguez]

On Mon, 22 Apr 2024 18:55:40 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

>> 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.

Sorry I didn't include this here but I filed https://bugs.openjdk.org/browse/JDK-8330277 for it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15825#discussion_r1575250288