perf: Add support for PERF_HW_COUNT_REF_CPU_CYCLES

Add new generic hw event: ref-cycles, which maps to
PERF_HW_COUNT_REF_CPUCYCLES:

 $ perf stat -e ref-cycles ls
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1323559734-3488-5-git-send-email-eranian@google.comSigned-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/util/parse-events.c

@@ -38,6 +38,7 @@ static struct event_symbol event_symbols[] = {
   { CHW(BRANCH_INSTRUCTIONS),		"branch-instructions",		"branches"		},
   { CHW(BRANCH_MISSES),			"branch-misses",		""			},
   { CHW(BUS_CYCLES),			"bus-cycles",			""			},
+  { CHW(REF_CPU_CYCLES),		"ref-cycles",			""			},
 
   { CSW(CPU_CLOCK),			"cpu-clock",			""			},
   { CSW(TASK_CLOCK),			"task-clock",			""			},
@@ -68,6 +69,7 @@ static const char *hw_event_names[PERF_COUNT_HW_MAX] = {
 	"bus-cycles",
 	"stalled-cycles-frontend",
 	"stalled-cycles-backend",
+	"ref-cycles",
 };
 
 static const char *sw_event_names[PERF_COUNT_SW_MAX] = {