RFR(M): 8216041: [Event Request] - Deoptimization

[Markus Gronlund]

Greetings,

Please review the following changeset to introduce a Deoptimization (uncommon trap)  event to JFR.

Igor Ignatyev has done related work under "JDK-8225554: add JFR event for uncommon trap" [1], and we have decided to merge our work, so this RFR will supersede the previous discussion related to JDK-8225554 [2].

Enhancement: https://bugs.openjdk.java.net/browse/JDK-8216041 
Webrev: http://cr.openjdk.java.net/~mgronlun/8216041/webrev01
Example visualization (raw JMC): http://cr.openjdk.java.net/~mgronlun/8216041/Deoptimization.jpg  
Summary: A description of which compiler compiled the method has been added, where descriptions are keyed by values from the CompilerType enumeration. This information has also been added to the Compilation event. The current suggestion is to have stack trace information turned off by default (default.jfc), but turned on when using profile.jfc.

[1] https://bugs.openjdk.java.net/browse/JDK-8225554 
[2] https://mail.openjdk.java.net/pipermail/hotspot-jfr-dev/2019-June/000631.html

Thank you
Markus