RFR: 8284849: Add deoptimization to unified logging [v7]

[Johan Sjölén]

On Thu, 9 Jun 2022 11:43:20 GMT, Johan Sjölén <duke at openjdk.java.net> wrote:

>> This PR adds a new "deoptimization" tag and a new log message on the info level mimicking JFR's deoptimization event. In the future this tag will be used to add trace level information, hopefully replacing TraceDeoptimization. JFR's event also captures the stacktrace, which this does not (happy to add this if considered important).
>> 
>> An example output looks like this: 
>> 
>> 
>> [1.346s][info][deoptimization] Deoptimization start {
>> [1.346s][info][deoptimization]   compileId = 407
>> [1.346s][info][deoptimization]   compiler = c2
>> [1.346s][info][deoptimization]   method:lineno:bci = java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(I)Z:176:26
>> [1.346s][info][deoptimization]   instruction = ifne
>> [1.346s][info][deoptimization]   reason = unstable_if
>> [1.346s][info][deoptimization]   action = reinterpret
>> [1.346s][info][deoptimization] } Deoptimization end
>
> Johan Sjölén has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix indentation

Current log line:

`[1.334s][debug][deoptimization] cid=206 level=4 java.util.concurrent.locks.ReentrantLock$Sync::tryRelease trap_bci=26 unstable_if reinterpret pc=0x00007f89dcbf4954 relative_pc=0x0000000000000154`

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PR: https://git.openjdk.java.net/jdk/pull/8812