Support for the Linux 'perf report' and 'perf annotate' tools.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 1c958856cfd6221bf94aeb8ea0a2eda3d10e88fb..61e545f9096862b047ed81513b6cf4279fe10182 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -785,6 +785,10 @@ DEFINE_bool(log_regexp, false, "Log regular expression execution.")
 DEFINE_string(logfile, "v8.log", "Specify the name of the log file.")
 DEFINE_bool(logfile_per_isolate, true, "Separate log files for each isolate.")
 DEFINE_bool(ll_prof, false, "Enable low-level linux profiler.")
+DEFINE_bool(perf_basic_prof, false,
+            "Enable perf linux profiler (basic support).")
+DEFINE_bool(perf_jit_prof, false,
+            "Enable perf linux profiler (experimental annotate support).")
 DEFINE_string(gc_fake_mmap, "/tmp/__v8_gc__",
               "Specify the name of the file for fake gc mmap used in ll_prof")
 DEFINE_bool(log_internal_timer_events, false, "Time internal events.")