Revert of Revert opus memcheck suppression

tools/valgrind-webrtc/memcheck/suppressions.txt

Index: tools/valgrind-webrtc/memcheck/suppressions.txt
diff --git a/tools/valgrind-webrtc/memcheck/suppressions.txt b/tools/valgrind-webrtc/memcheck/suppressions.txt
index 9919522e8382604c6786bddb4677fa599c26bc9b..fce9259b92015e8ef27e6742f65110fc8bcb9987 100644
--- a/tools/valgrind-webrtc/memcheck/suppressions.txt
+++ b/tools/valgrind-webrtc/memcheck/suppressions.txt
@@ -416,3 +416,16 @@
    fun:_ZN12_GLOBAL__N_118StatsCollectorTest22TestCertificateReportsERKN3rtc18FakeSSLCertificateERKSt6vectorISsSaISsEES4_S9_
    fun:_ZN12_GLOBAL__N_156StatsCollectorTest_ChainedCertificateReportsCreated_Test8TestBodyEv
 }
+{
+   bug_5651
+   Memcheck:Unaddressable
+   fun:silk_NLSF_encode
+   fun:silk_process_NLSFs
+   fun:silk_process_NLSFs_FLP
+   fun:silk_find_pred_coefs_FLP
+   fun:silk_encode_frame_FLP
+   fun:silk_Encode
+   fun:opus_encode_native
+   fun:opus_encode
+   fun:WebRtcOpus_Encode
+}