RFR: 8344009: Improve compiler memory statistics [v6]

[Thomas Stuefe]

On Wed, 26 Feb 2025 12:33:14 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with five additional commits since the last revision:
>> 
>>  - feedback ashu
>>  - feedback roberto
>>  - final-statistics-switch
>>  - performance fix
>>  - remove test code
>
> src/hotspot/share/compiler/compilationMemoryStatistic.cpp line 306:
> 
>> 304:   if (_comp_type == compiler_c2) {
>> 305:     // Update C2 node count
>> 306:     // Careful, Compile::current() may be NULL in a short time window when Compile itself
> 
> The recently added `sources/TestNoNULL.java` test fails due to this occurrence of `NULL`.
> Suggestion:
> 
>     // Careful, Compile::current() may be null in a short time window when Compile itself

Thanks. We should add those to GHAs.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23530#discussion_r1976320472