perf/x86/intel: Fix SLOTS PEBS event constraint

Sampling SLOTS event and ref-cycles event in a group on Icelake gives
EINVAL.

SLOTS event is the event stands for the fixed counter 3, not fixed
counter 2. Wrong mask was set to SLOTS event in
intel_icl_pebs_event_constraints[].
Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 60176089 ("perf/x86/intel: Add Icelake support")
Link: https://lkml.kernel.org/r/20190723200429.8180-1-kan.liang@linux.intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/events/intel/ds.c

@@ -851,7 +851,7 @@ struct event_constraint intel_skl_pebs_event_constraints[] = {
 
 struct event_constraint intel_icl_pebs_event_constraints[] = {
 	INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x100000000ULL),	/* INST_RETIRED.PREC_DIST */
-	INTEL_FLAGS_UEVENT_CONSTRAINT(0x0400, 0x400000000ULL),	/* SLOTS */
+	INTEL_FLAGS_UEVENT_CONSTRAINT(0x0400, 0x800000000ULL),	/* SLOTS */
 
 	INTEL_PLD_CONSTRAINT(0x1cd, 0xff),			/* MEM_TRANS_RETIRED.LOAD_LATENCY */
 	INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x1d0, 0xf),	/* MEM_INST_RETIRED.LOAD */