Linux perf integration with the new support for JIT.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index 79eabfb2effc8aeba21d002f5a7c58bcd74cc30e..56add0790d5a224116396da0dd900fd35f18b735 100644
--- a/src/log.h
+++ b/src/log.h
@@ -145,6 +145,7 @@ struct TickSample;
 class JitLogger;
 class PerfBasicLogger;
 class LowLevelLogger;
+class PerfJitLogger;
 class Sampler;
 
 class Logger {
@@ -393,6 +394,7 @@ class Logger {
   bool is_logging_;
   Log* log_;
   PerfBasicLogger* perf_basic_logger_;
+  PerfJitLogger* perf_jit_logger_;
   LowLevelLogger* ll_logger_;
   JitLogger* jit_logger_;
   List<CodeEventListener*> listeners_;