Commits on May 12, 2021

1. Enable JitDump support on JITServer …

   This commit allows server to produce a JitDump log when a crash occurs
   during a compilation.
   
   Once the crash happens, the JitDump handler runs normally, producing
   an IL log of the crashed thread until it reaches the point when
   the problematic method needs to be recompiled. There, it sends
   the client a `compilationThreadCrashed` message, asking it to schedule
   a JitDump recompilation and blocks until the recompilation is done.
   
   When the client receives the error message, it temporarily stops all
   further compilations, purges the compilation queue and sends a request
   to the server to recompile the method as a JitDump compilation.
   The server will compile the method on the diagnostic thread, notify
   the waiting crashed thread, allowing the JitDump handler to finish and
   terminate the server.
   
   Once the diagnostic compilation is complete, the client will resume
   compilations locally until another server comes up.
   
   Closes: eclipse-openj9#12394
   
   Signed-off-by: Dmitry Ten <Dmitry.Ten@ibm.com>

   

   dmitry-ten committed May 12, 2021
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