RFR: 8281548: Add escape analysis tracing flag [v4]

[Jorn Vernee]

On Wed, 16 Feb 2022 04:41:43 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Review comments
>
> src/hotspot/share/opto/escape.cpp line 1832:
> 
>> 1830:         // Mark all objects.
>> 1831:         set_not_scalar_replaceable(jobj NOT_PRODUCT(COMMA "is merged with other object"));
>> 1832:         set_not_scalar_replaceable(ptn NOT_PRODUCT(COMMA "is merged with other object"));
> 
> how about we also dump Java Object(x) here? eg. 
> 
> JavaObject(8) NoEscape(NoEscape) is NSR. is merged with other java object(4)
> JavaObject(4) GlobalEscape(GlobalEscape) NSR is NSR. is merged with other java object(8)

That seems like a good idea. Will apply it

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PR: https://git.openjdk.java.net/jdk/pull/7428