RFR: 8289943: Simplify some object allocation merges [v8]

[Vladimir Kozlov]

On Tue, 20 Sep 2022 20:14:08 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Cesar Soares has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove debug messages.
>
> src/hotspot/share/opto/escape.cpp line 683:
> 
>> 681:   }
>> 682: 
>> 683:   if (mixed_klasses && has_call_as_user) {
> 
> Add comment that only the same Klass is allowed if merged allocations are referenced by SafePoint or Uncommon
> trap.

You also need to bail out `has_nonnull_nonsr_input` case here. You can have not Allocation in such case (for example, argument) which you can't reallocate during deoptimization and you don't know its actual Klass.

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PR: https://git.openjdk.org/jdk/pull/9073